diff --git a/seafile_sync/Dockerfile b/seafile_sync/Dockerfile
index 6950814..4f335ae 100644
--- a/seafile_sync/Dockerfile
+++ b/seafile_sync/Dockerfile
@@ -1,2 +1,6 @@
 # https://gitlab.com/flwgns-docker/seafile-client/
+args:
+  SEAF_SERVER_URL: $SEAF_SERVER_URL
+
+
 FROM flowgunso/seafile-client:latest