diff --git a/basic/srv/vm/mgr/tools.py b/basic/srv/vm/mgr/tools.py
index 0c4f350..59c8373 100644
--- a/basic/srv/vm/mgr/tools.py
+++ b/basic/srv/vm/mgr/tools.py
@@ -13,7 +13,7 @@ import subprocess
 NULL_IP = '[100::1]'
 
 def compile_url(domain, port, proto='https'):
-    port = ':{}'.format(port) if (proto == 'https' and port != '443') or (proto == 'http' and port != '80') else ''
+    port = '' if (proto == 'https' and  port == '443') or (proto == 'http' and port == '80') else ':{}'.format(port)
     host = '{}{}'.format(domain, port)
     return '{}://{}'.format(proto, host) if proto is not None else host