diff --git a/core/admin/start.py b/core/admin/start.py
index 0d7f2110..c5b3bc23 100755
--- a/core/admin/start.py
+++ b/core/admin/start.py
@@ -55,7 +55,7 @@ test_DNS()
 start_command=" ".join([
     "gunicorn",
     f"--threads {str(os.cpu_count())}",
-    "-b :80",
+	"-b [::]:80",
     "--logger-class mailu.Logger",
     "--worker-tmp-dir /dev/shm",
     "--access-logfile -" if (log.root.level<=log.INFO) else "",