diff --git a/app/startup.sh b/app/startup.sh
index bb8671b..fe46213 100755
--- a/app/startup.sh
+++ b/app/startup.sh
@@ -1,6 +1,6 @@
 #!/bin/sh -ex
 
-while ! pg_isready -h $DB_HOST; do
+while ! pg_isready -h $DB_HOST -U $DB_USER; do
 	echo waiting until $DB_HOST is ready...
 	sleep 3
 done