diff --git a/php-base/stackdriver-files/enable_stackdriver_integration.sh b/php-base/stackdriver-files/enable_stackdriver_integration.sh
index a88639c5..6f1a52f9 100755
--- a/php-base/stackdriver-files/enable_stackdriver_integration.sh
+++ b/php-base/stackdriver-files/enable_stackdriver_integration.sh
@@ -29,5 +29,5 @@ echo "Enabling stackdriver integration..."
 cp /stackdriver-files/batch-daemon.conf /etc/supervisor/conf.d
 
 php /stackdriver-files/enable_stackdriver_prepend.php \
-    -a ${APP_DIR}
+    -a ${APP_DIR} \
     -o ${PHP_DIR}/lib/conf.d/stackdriver-prepend.ini