diff --git a/start.sh b/start.sh
index b279933..921c811 100755
--- a/start.sh
+++ b/start.sh
@@ -81,6 +81,6 @@ PARAMS+=("${NEXTCLOUD_URL}")
 
 # main loop
 while true; do
-	/bin/su -s /bin/sh "${USER_NAME}" -c /usr/bin/nextcloudcmd "${PARAMS[@]}"
+	/bin/su -s /bin/sh "${USER_NAME}" -- /usr/bin/nextcloudcmd "${PARAMS[@]}"
 	sleep "${NEXTCLOUD_SLEEP}"
 done