diff --git a/Dockerfile b/Dockerfile
index cabdb79..b19c70f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,4 +8,6 @@ ENV GITEA__database__PASSWD=${DATABASE_PASSWORD}
 
 ENV GITEA_CUSTOM=/var/lib/gitea/custom
 
+ENV DATABASE_URL='db:5432'
+
 COPY app.ini /var/lib/gitea/custom/conf/app.ini