diff --git a/aio/scripts/deploy-to-firebase.sh b/aio/scripts/deploy-to-firebase.sh
index 1542067de0..90ccedd954 100755
--- a/aio/scripts/deploy-to-firebase.sh
+++ b/aio/scripts/deploy-to-firebase.sh
@@ -78,7 +78,7 @@ echo "Build/deploy mode : $deployEnv"
 echo "Firebase project  : $projectId"
 echo "Deployment URL    : $deployedUrl"
 
-if [[ $1 == "--dry-run" ]]; then
+if [[ ${1:-} == "--dry-run" ]]; then
   exit 0
 fi