diff --git a/build_library/sysext_prod_builder b/build_library/sysext_prod_builder
index 8e57080630..5406c884d7 100755
--- a/build_library/sysext_prod_builder
+++ b/build_library/sysext_prod_builder
@@ -15,6 +15,7 @@ SCRIPT_ROOT="$(cd "$(dirname "$(readlink -f "$0")")/../"; pwd)"
 assert_inside_chroot
 switch_to_strict_mode
 
+. "${BUILD_LIBRARY_DIR}/toolchain_util.sh" || exit 1
 . "${BUILD_LIBRARY_DIR}/build_image_util.sh" || exit 1
 
 # Create a sysext from a package and install it to the OS image.
diff --git a/build_library/write_hdd.sh b/build_library/write_hdd.sh
index f6da7f94c3..85c892f349 100755
--- a/build_library/write_hdd.sh
+++ b/build_library/write_hdd.sh
@@ -6,6 +6,7 @@
 
 SCRIPT_ROOT=$(readlink -f $(dirname "$0")/..)
 . "${SCRIPT_ROOT}/common.sh" || exit 1
+. "${BUILD_LIBRARY_DIR}/toolchain_util.sh" || exit 1
 . "${BUILD_LIBRARY_DIR}/build_image_util.sh" || exit 1
 
 DEFINE_string input_disk_image "" "Disk image to convert from, required."