diff --git a/tools/osbuilder/rootfs-builder/debian/rootfs_lib.sh b/tools/osbuilder/rootfs-builder/debian/rootfs_lib.sh
index fa6eb48706..9591302902 100644
--- a/tools/osbuilder/rootfs-builder/debian/rootfs_lib.sh
+++ b/tools/osbuilder/rootfs-builder/debian/rootfs_lib.sh
@@ -5,4 +5,6 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # NOTE: Re-using ubuntu rootfs lib, see 'ubuntu' folder for details.
-source ${script_dir}/ubuntu/$LIB_SH
+# shellcheck disable=SC2154
+# shellcheck source=/dev/null
+source "${script_dir}/ubuntu/${LIB_SH}"