diff --git a/build_when_required.sh b/build_when_required.sh
index 60edc1e..fde7e7f 100755
--- a/build_when_required.sh
+++ b/build_when_required.sh
@@ -2,7 +2,11 @@
 # Args: <config-file> <arch> <builder-args> [<repo>]
 
 CONFIG_DIR="$(dirname "$0")" &&
-"$CONFIG_DIR/hash_modules.py" --require-build --installed "$1" "$2" &&
-exec "$CONFIG_DIR/build.sh" "$@"
+if [ -z "$4" ]; then
+    exec "$CONFIG_DIR/build.sh" "$@"
+else
+    "$CONFIG_DIR/hash_modules.py" --require-build --installed "$1" "$2" &&
+    exec "$CONFIG_DIR/build.sh" "$@"
+fi
 
 echo "No rebuild required."
\ No newline at end of file