diff --git a/gen_config.py b/gen_config.py
index 210c3429313cfed6b34d66fe4252e77811f455ec..c3ff0a2b5b8269ab7aca76c5d359757f631401ed 100755
--- a/gen_config.py
+++ b/gen_config.py
@@ -9,9 +9,9 @@ import json
 import mpildap
 
 def err(msg):
-    print(msg, file=sys.stderr)
+    print('ERROR: '+msg, file=sys.stderr)
 def warn(msg):
-    print(msg, file=sys.stderr)
+    print('WARNING: '+msg, file=sys.stderr)
 def info(msg):
     print(msg)
 
@@ -75,7 +75,7 @@ for k in 'umbrella_list topics emergency personalize member_moderation_action we
         continue
     if isinstance(value, str):
         value = value.replace('\n', '\\n')
-    warn(f'WARNING: "{k}" is set (or non-default), automatic migration not support, please fix manually: "{value}"')
+    warn(f'"{k}" is set (or non-default), automatic migration not support, please fix manually: "{value}"')
 
 
 xml = ET.Element("list")