diff --git a/start b/start
index 30effd8..75406f5 100755
--- a/start
+++ b/start
@@ -23,7 +23,7 @@ fi
 
 if [[ "$1" == "prod" ]]; then
     echo "Starting gunicorn production server..."
-    gunicorn -b localhost:$PROD_PORT "app:create_app()"
+    gunicorn -b "localhost:$PROD_PORT" "app:create_app()"
 else
     echo "Starting local dev server..."
     export FLASK_APP=app