diff --git a/build-system/scripts/build_local b/build-system/scripts/build_local
index 4cd91c28f04..c8acf6715c2 100755
--- a/build-system/scripts/build_local
+++ b/build-system/scripts/build_local
@@ -8,7 +8,7 @@
 
 set -eu
 
-TARGET_PROJECT=$1
+TARGET_PROJECT=${1:-}
 ONLY_TARGET=${2:-}
 
 if [ -n "${NO_CACHE:-}" ]; then