diff --git a/config/update_files.sh b/config/update_files.sh
index 4f45939..82c8c8b 100755
--- a/config/update_files.sh
+++ b/config/update_files.sh
@@ -9,14 +9,21 @@ gen_files() {
 }
 
 update_files_from() {
-	SRC=$1 yq -i '.autoinstall.user-data.write_files |= load(strenv(SRC)).write_files' nocloud/user-data
+	SRC="$2" yq -i '.autoinstall.user-data.write_files |= load(strenv(SRC)).write_files' "$1"
+}
+
+remove_trailing_whitespace() {
+	sed -i 's/[ \t]*$//' "$1"
 }
 
 pushd config >/dev/null 2>&1
 
+TARGET_YML="nocloud/user-data"
 TMP_YML=$(temp_yml)
+
 gen_files "$TMP_YML"
-update_files_from "$TMP_YML"
+remove_trailing_whitespace "$TARGET_YML"
+update_files_from "$TARGET_YML" "$TMP_YML"
 rm -f "$TMP_YML"
 
 popd >/dev/null 2>&1