diff --git a/extensions/detect-unused-extensions.sh b/extensions/detect-unused-extensions.sh
index 9d0e7efb8..73989925e 100644
--- a/extensions/detect-unused-extensions.sh
+++ b/extensions/detect-unused-extensions.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 ## Configuration
 export LOG_ALL_HOOK_TRACES=no # Should we log all hook function traces to stdout? (no, or level: wrn info)
 
diff --git a/extensions/flash-kernel.sh b/extensions/flash-kernel.sh
index 510e0c0ad..283a38bd7 100644
--- a/extensions/flash-kernel.sh
+++ b/extensions/flash-kernel.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # This runs *after* user_config. Don't change anything not coming from other variables or meant to be configured by the user.
 function extension_prepare_config__prepare_flash_kernel() {
 	# Configuration defaults, or lack thereof.
diff --git a/extensions/gen-sample-extension-docs.sh b/extensions/gen-sample-extension-docs.sh
index 6a88baa40..7c0851c12 100644
--- a/extensions/gen-sample-extension-docs.sh
+++ b/extensions/gen-sample-extension-docs.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 ## Hooks
 function extension_metadata_ready__499_display_docs_generation_start_info() {
 	display_alert "Generating hook documentation and sample extension"
diff --git a/extensions/grub-riscv64.sh b/extensions/grub-riscv64.sh
index 4678a416c..87f51f4e4 100644
--- a/extensions/grub-riscv64.sh
+++ b/extensions/grub-riscv64.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # This runs *after* user_config. Don't change anything not coming from other variables or meant to be configured by the user.
 function extension_prepare_config__prepare_grub-riscv64() {
 	display_alert "Prepare config" "${EXTENSION}" "info"
diff --git a/extensions/grub-sbc-media.sh b/extensions/grub-sbc-media.sh
index eefbf6bf0..6a4dc9247 100644
--- a/extensions/grub-sbc-media.sh
+++ b/extensions/grub-sbc-media.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # This runs *after* user_config. Don't change anything not coming from other variables or meant to be configured by the user.
 	function extension_prepare_config__prepare_grub-sbc-media() {
 	display_alert "Prepare config" "${EXTENSION}" "info"
diff --git a/extensions/grub.sh b/extensions/grub.sh
index 777e4e775..d70c5ea52 100644
--- a/extensions/grub.sh
+++ b/extensions/grub.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # This runs *after* user_config. Don't change anything not coming from other variables or meant to be configured by the user.
 function extension_prepare_config__prepare_flash_kernel() {
 	# Extension configuration defaults.
diff --git a/extensions/marvell-tools.sh b/extensions/marvell-tools.sh
index 95f106b9f..9a3d96e53 100644
--- a/extensions/marvell-tools.sh
+++ b/extensions/marvell-tools.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 function fetch_sources_tools__marvell_tools() {
 	fetch_from_repo "https://github.com/MarvellEmbeddedProcessors/A3700-utils-marvell" "marvell-tools" "branch:master"
 	fetch_from_repo "https://github.com/MarvellEmbeddedProcessors/mv-ddr-marvell.git" "marvell-ddr" "branch:master"
diff --git a/extensions/nvidia.sh b/extensions/nvidia.sh
index abee53f8f..77734bc60 100644
--- a/extensions/nvidia.sh
+++ b/extensions/nvidia.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 function pre_install_kernel_debs__build_nvidia_kernel_module() {
 
 	export INSTALL_HEADERS="yes"
diff --git a/extensions/rkbin-tools.sh b/extensions/rkbin-tools.sh
index 5617857cb..96bc37f3b 100644
--- a/extensions/rkbin-tools.sh
+++ b/extensions/rkbin-tools.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 function fetch_sources_tools__rkbin_tools() {
 	fetch_from_repo "https://github.com/armbian/rkbin" "rkbin-tools" "branch:master"
 }
diff --git a/extensions/sunxi-tools.sh b/extensions/sunxi-tools.sh
index 5b699ac14..0d33eb0ff 100644
--- a/extensions/sunxi-tools.sh
+++ b/extensions/sunxi-tools.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 function fetch_sources_tools__sunxi_tools() {
 	fetch_from_repo "https://github.com/linux-sunxi/sunxi-tools" "sunxi-tools" "branch:master"
 }
diff --git a/lib/extensions.sh b/lib/extensions.sh
index 4c93a643a..e3bbfac52 100644
--- a/lib/extensions.sh
+++ b/lib/extensions.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # global variables managing the state of the extension manager. treat as private.
 declare -A extension_function_info                # maps a function name to a string with KEY=VALUEs information about the defining extension
 declare -i initialize_extension_manager_counter=0 # how many times has the extension manager initialized?
diff --git a/lib/functions/bsp/bsp-cli.sh b/lib/functions/bsp/bsp-cli.sh
index 504f3efd0..cb51d9e6e 100644
--- a/lib/functions/bsp/bsp-cli.sh
+++ b/lib/functions/bsp/bsp-cli.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 create_board_package() {
 	display_alert "Creating board support package for CLI" "$CHOSEN_ROOTFS" "info"
 
diff --git a/lib/functions/bsp/bsp-desktop.sh b/lib/functions/bsp/bsp-desktop.sh
index 60c722761..4f318b396 100644
--- a/lib/functions/bsp/bsp-desktop.sh
+++ b/lib/functions/bsp/bsp-desktop.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 create_desktop_package() {
 
 	echo "Showing PACKAGE_LIST_DESKTOP before postprocessing" >> "${DEST}"/${LOG_SUBPATH}/output.log
diff --git a/lib/functions/bsp/utils-bsp.sh b/lib/functions/bsp/utils-bsp.sh
index 42215128a..30422475d 100644
--- a/lib/functions/bsp/utils-bsp.sh
+++ b/lib/functions/bsp/utils-bsp.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # copy_all_packages_files_for <folder> to package
 #
 copy_all_packages_files_for() {
diff --git a/lib/functions/cli/cli-entrypoint.sh b/lib/functions/cli/cli-entrypoint.sh
index 2d86c1cc4..e60dee398 100644
--- a/lib/functions/cli/cli-entrypoint.sh
+++ b/lib/functions/cli/cli-entrypoint.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 function cli_entrypoint() {
 	if [[ "${ARMBIAN_ENABLE_CALL_TRACING}" == "yes" ]]; then
 		set -T # inherit return/debug traps
diff --git a/lib/functions/cli/utils-cli.sh b/lib/functions/cli/utils-cli.sh
index a1e9b176e..909b420e1 100644
--- a/lib/functions/cli/utils-cli.sh
+++ b/lib/functions/cli/utils-cli.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 #  Add the variables needed at the beginning of the path
 check_args() {
 
diff --git a/lib/functions/compilation/atf.sh b/lib/functions/compilation/atf.sh
index 7d6f96ac9..56d8bfd3c 100644
--- a/lib/functions/compilation/atf.sh
+++ b/lib/functions/compilation/atf.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 compile_atf() {
 	if [[ $CLEAN_LEVEL == *make* ]]; then
 		display_alert "Cleaning" "$ATFSOURCEDIR" "info"
diff --git a/lib/functions/compilation/debs.sh b/lib/functions/compilation/debs.sh
index dad5cbf59..7128b92ec 100644
--- a/lib/functions/compilation/debs.sh
+++ b/lib/functions/compilation/debs.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 compile_firmware() {
 	display_alert "Merging and packaging linux firmware" "@host" "info"
 
diff --git a/lib/functions/compilation/kernel-debs.sh b/lib/functions/compilation/kernel-debs.sh
index a072fd355..be10a6d6e 100644
--- a/lib/functions/compilation/kernel-debs.sh
+++ b/lib/functions/compilation/kernel-debs.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 create_linux-source_package() {
 	ts=$(date +%s)
 	local sources_pkg_dir tmp_src_dir
diff --git a/lib/functions/compilation/kernel.sh b/lib/functions/compilation/kernel.sh
index cb630bb5e..a893f6620 100644
--- a/lib/functions/compilation/kernel.sh
+++ b/lib/functions/compilation/kernel.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 compile_kernel() {
 	if [[ $CLEAN_LEVEL == *make* ]]; then
 		display_alert "Cleaning" "$LINUXSOURCEDIR" "info"
diff --git a/lib/functions/compilation/patch/kernel-bootsplash-and-drivers.sh b/lib/functions/compilation/patch/kernel-bootsplash-and-drivers.sh
index eaf3fd080..39d93b922 100644
--- a/lib/functions/compilation/patch/kernel-bootsplash-and-drivers.sh
+++ b/lib/functions/compilation/patch/kernel-bootsplash-and-drivers.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 compilation_prepare() {
 
 	# Packaging patch for modern kernels should be one for all.
diff --git a/lib/functions/compilation/patch/patching.sh b/lib/functions/compilation/patch/patching.sh
index cfb02dc25..dd0bbe5aa 100644
--- a/lib/functions/compilation/patch/patching.sh
+++ b/lib/functions/compilation/patch/patching.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # advanced_patch <dest> <family> <board> <target> <branch> <description>
 #
 # parameters:
diff --git a/lib/functions/compilation/uboot.sh b/lib/functions/compilation/uboot.sh
index 0e76c5098..9073c87aa 100644
--- a/lib/functions/compilation/uboot.sh
+++ b/lib/functions/compilation/uboot.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 compile_uboot() {
 	# not optimal, but extra cleaning before overlayfs_wrapper should keep sources directory clean
 	if [[ $CLEAN_LEVEL == *make* ]]; then
diff --git a/lib/functions/compilation/utils-compilation.sh b/lib/functions/compilation/utils-compilation.sh
index 05f517ec3..9e649041c 100644
--- a/lib/functions/compilation/utils-compilation.sh
+++ b/lib/functions/compilation/utils-compilation.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 grab_version() {
 	local ver=()
 	ver[0]=$(grep "^VERSION" "${1}"/Makefile | head -1 | awk '{print $(NF)}' | grep -oE '^[[:digit:]]+')
diff --git a/lib/functions/configuration/aggregation.sh b/lib/functions/configuration/aggregation.sh
index 1acd8591f..1d657ffd7 100644
--- a/lib/functions/configuration/aggregation.sh
+++ b/lib/functions/configuration/aggregation.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # Expected variables
 # - aggregated_content
 # - potential_paths
diff --git a/lib/functions/configuration/config-desktop.sh b/lib/functions/configuration/config-desktop.sh
index 070e0738e..dce891343 100644
--- a/lib/functions/configuration/config-desktop.sh
+++ b/lib/functions/configuration/config-desktop.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 desktop_element_available_for_arch() {
 	local desktop_element_path="${1}"
 	local targeted_arch="${2}"
diff --git a/lib/functions/configuration/interactive.sh b/lib/functions/configuration/interactive.sh
index 146b68f6d..dd4f718ee 100644
--- a/lib/functions/configuration/interactive.sh
+++ b/lib/functions/configuration/interactive.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 function interactive_config_prepare_terminal() {
 	if [[ -z $ROOT_FS_CREATE_ONLY ]]; then
 		# override stty size
diff --git a/lib/functions/configuration/menu.sh b/lib/functions/configuration/menu.sh
index d4aeeedf9..a0dff7fe1 100644
--- a/lib/functions/configuration/menu.sh
+++ b/lib/functions/configuration/menu.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # Myy : Menu configuration for choosing desktop configurations
 show_menu() {
 	provided_title=$1
diff --git a/lib/functions/extras/buildpkg.sh b/lib/functions/extras/buildpkg.sh
index 4b286ecdd..126e4c6a6 100644
--- a/lib/functions/extras/buildpkg.sh
+++ b/lib/functions/extras/buildpkg.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # create_chroot <target_dir> <release> <arch>
 #
 create_chroot() {
diff --git a/lib/functions/extras/installpkg.sh b/lib/functions/extras/installpkg.sh
index a4e604646..60f2132bd 100644
--- a/lib/functions/extras/installpkg.sh
+++ b/lib/functions/extras/installpkg.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # Installing debian packages or package files in the armbian build system.
 # The function accepts four optional parameters:
 # autoupdate - If the installation list is not empty then update first.
diff --git a/lib/functions/general/chroot-helpers.sh b/lib/functions/general/chroot-helpers.sh
index 117503142..c4a7c5060 100644
--- a/lib/functions/general/chroot-helpers.sh
+++ b/lib/functions/general/chroot-helpers.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # mount_chroot <target>
 #
 # helper to reduce code duplication
diff --git a/lib/functions/general/downloads.sh b/lib/functions/general/downloads.sh
index 15d30837f..6ee459ca3 100644
--- a/lib/functions/general/downloads.sh
+++ b/lib/functions/general/downloads.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 function get_urls() {
 	local catalog=$1
 	local filename=$2
diff --git a/lib/functions/general/git.sh b/lib/functions/general/git.sh
index 0a75a0f11..9ad3eca77 100644
--- a/lib/functions/general/git.sh
+++ b/lib/functions/general/git.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 #
 # This function retries Git operations to avoid failure in case remote is borked
 # If the git team needs to call a remote server, use this function.
diff --git a/lib/functions/general/repo.sh b/lib/functions/general/repo.sh
index 987e0557d..1fcd1cdf4 100644
--- a/lib/functions/general/repo.sh
+++ b/lib/functions/general/repo.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 adding_packages() {
 	# add deb files to repository if they are not already there
 
diff --git a/lib/functions/host/basic-deps.sh b/lib/functions/host/basic-deps.sh
index 81155a125..4b19b4eb6 100644
--- a/lib/functions/host/basic-deps.sh
+++ b/lib/functions/host/basic-deps.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # prepare_host_basic
 #
 # * installs only basic packages
diff --git a/lib/functions/host/host-utils.sh b/lib/functions/host/host-utils.sh
index 8f8c49484..fac8d6485 100644
--- a/lib/functions/host/host-utils.sh
+++ b/lib/functions/host/host-utils.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # wait_for_package_manager
 #
 # * installation will break if we try to install when package manager is running
diff --git a/lib/functions/host/prepare-host.sh b/lib/functions/host/prepare-host.sh
index f10e4ce86..df31f9c01 100644
--- a/lib/functions/host/prepare-host.sh
+++ b/lib/functions/host/prepare-host.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # prepare_host
 #
 # * checks and installs necessary packages
diff --git a/lib/functions/image/fingerprint.sh b/lib/functions/image/fingerprint.sh
index 8da6b7781..baddd27a4 100644
--- a/lib/functions/image/fingerprint.sh
+++ b/lib/functions/image/fingerprint.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 #--------------------------------------------------------------------------------------------------------------------------------
 # fingerprint_image <out_txt_file> [image_filename]
 # Saving build summary to the image
diff --git a/lib/functions/image/initrd.sh b/lib/functions/image/initrd.sh
index 0fbf3033b..35a61b21d 100644
--- a/lib/functions/image/initrd.sh
+++ b/lib/functions/image/initrd.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # update_initramfs
 #
 # this should be invoked as late as possible for any modifications by
diff --git a/lib/functions/image/loop.sh b/lib/functions/image/loop.sh
index 913f9f429..8fd8e464a 100644
--- a/lib/functions/image/loop.sh
+++ b/lib/functions/image/loop.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # check_loop_device <device_node>
 #
 check_loop_device() {
diff --git a/lib/functions/image/partitioning.sh b/lib/functions/image/partitioning.sh
index bb1828894..a6df23673 100644
--- a/lib/functions/image/partitioning.sh
+++ b/lib/functions/image/partitioning.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # prepare_partitions
 #
 # creates image file, partitions and fs
diff --git a/lib/functions/image/rootfs-to-image.sh b/lib/functions/image/rootfs-to-image.sh
index b592b2fe6..5a2c4365e 100644
--- a/lib/functions/image/rootfs-to-image.sh
+++ b/lib/functions/image/rootfs-to-image.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # create_image
 #
 # finishes creation of image from cached rootfs
diff --git a/lib/functions/logging/logging.sh b/lib/functions/logging/logging.sh
index 38ee70061..a2eb14b7b 100644
--- a/lib/functions/logging/logging.sh
+++ b/lib/functions/logging/logging.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 #--------------------------------------------------------------------------------------------------------------------------------
 # Let's have unique way of displaying alerts
 #--------------------------------------------------------------------------------------------------------------------------------
diff --git a/lib/functions/logging/runners.sh b/lib/functions/logging/runners.sh
index bcd0b793a..2a7053699 100644
--- a/lib/functions/logging/runners.sh
+++ b/lib/functions/logging/runners.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 run_on_sdcard() {
 
 	# Lack of quotes allows for redirections and pipes easily.
diff --git a/lib/functions/logging/traps.sh b/lib/functions/logging/traps.sh
index 9d3fd5b3b..be27e1452 100644
--- a/lib/functions/logging/traps.sh
+++ b/lib/functions/logging/traps.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # exit_with_error <message> <highlight>
 #
 # a way to terminate build process
diff --git a/lib/functions/main/build-tasks.sh b/lib/functions/main/build-tasks.sh
index 5a4a33e12..6910ab009 100644
--- a/lib/functions/main/build-tasks.sh
+++ b/lib/functions/main/build-tasks.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 ###############################################################################
 #
 # build_task_is_enabled()
diff --git a/lib/functions/main/config-prepare.sh b/lib/functions/main/config-prepare.sh
index 5553710cf..4912f6974 100644
--- a/lib/functions/main/config-prepare.sh
+++ b/lib/functions/main/config-prepare.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 DISTRIBUTIONS_DESC_DIR="config/distributions"
 
 function prepare_and_config_main_build_single() {
diff --git a/lib/functions/main/rootfs-image.sh b/lib/functions/main/rootfs-image.sh
index 9847350ce..8ce987a01 100644
--- a/lib/functions/main/rootfs-image.sh
+++ b/lib/functions/main/rootfs-image.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # unmount_on_exit
 #
 unmount_on_exit() {
diff --git a/lib/functions/rootfs/apt-install.sh b/lib/functions/rootfs/apt-install.sh
index 79bf82004..74d15ad66 100644
--- a/lib/functions/rootfs/apt-install.sh
+++ b/lib/functions/rootfs/apt-install.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 install_deb_chroot() {
 
 	local package=$1
diff --git a/lib/functions/rootfs/apt-sources.sh b/lib/functions/rootfs/apt-sources.sh
index 2199ce881..a6a21a631 100644
--- a/lib/functions/rootfs/apt-sources.sh
+++ b/lib/functions/rootfs/apt-sources.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 install_ppa_prerequisites() {
 
 	# Myy : So... The whole idea is that, a good bunch of external sources
diff --git a/lib/functions/rootfs/boot_logo.sh b/lib/functions/rootfs/boot_logo.sh
index f206b041a..e3ab0d49f 100644
--- a/lib/functions/rootfs/boot_logo.sh
+++ b/lib/functions/rootfs/boot_logo.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 #--------------------------------------------------------------------------------------------------------------------------------
 # Create kernel boot logo from packages/blobs/splash/logo.png and packages/blobs/splash/spinner.gif (animated)
 # and place to the file /lib/firmware/bootsplash
diff --git a/lib/functions/rootfs/create-cache.sh b/lib/functions/rootfs/create-cache.sh
index 6a1f89485..199dbd9ca 100644
--- a/lib/functions/rootfs/create-cache.sh
+++ b/lib/functions/rootfs/create-cache.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # get_package_list_hash
 #
 # returns md5 hash for current package list and rootfs cache version
diff --git a/lib/functions/rootfs/customize.sh b/lib/functions/rootfs/customize.sh
index fd06596e5..3c526d301 100644
--- a/lib/functions/rootfs/customize.sh
+++ b/lib/functions/rootfs/customize.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 customize_image() {
 
 	# for users that need to prepare files at host
diff --git a/lib/functions/rootfs/distro-agnostic.sh b/lib/functions/rootfs/distro-agnostic.sh
index ce87c7892..bf7ea3762 100644
--- a/lib/functions/rootfs/distro-agnostic.sh
+++ b/lib/functions/rootfs/distro-agnostic.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 install_common() {
 	display_alert "Applying common tweaks" "" "info"
 
diff --git a/lib/functions/rootfs/distro-specific.sh b/lib/functions/rootfs/distro-specific.sh
index ea0fb9b8b..040492a2e 100644
--- a/lib/functions/rootfs/distro-specific.sh
+++ b/lib/functions/rootfs/distro-specific.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 install_distribution_specific() {
 
 	display_alert "Applying distribution specific tweaks for" "$RELEASE" "info"
diff --git a/lib/functions/rootfs/post-tweaks.sh b/lib/functions/rootfs/post-tweaks.sh
index c7cb23ea9..b3860ae11 100644
--- a/lib/functions/rootfs/post-tweaks.sh
+++ b/lib/functions/rootfs/post-tweaks.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 post_debootstrap_tweaks() {
 
 	# remove service start blockers and QEMU binary
diff --git a/lib/functions/rootfs/rootfs-desktop.sh b/lib/functions/rootfs/rootfs-desktop.sh
index a7fcf85cd..597bbc96a 100644
--- a/lib/functions/rootfs/rootfs-desktop.sh
+++ b/lib/functions/rootfs/rootfs-desktop.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 desktop_postinstall() {
 
 	# disable display manager for the first run
diff --git a/lib/import-functions.sh b/lib/import-functions.sh
index f8fdc7627..933ca186b 100644
--- a/lib/import-functions.sh
+++ b/lib/import-functions.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 while read -r file; do
 	# shellcheck source=/dev/null