diff --git a/moulinette/core.py b/moulinette/core.py
index 894c85b8..24c72495 100644
--- a/moulinette/core.py
+++ b/moulinette/core.py
@@ -412,8 +412,8 @@ def clean_session(session_id, profiles=[]):
 
 class MoulinetteError(StandardError):
     """Moulinette base exception"""
-    def __init__(self, key, __raw_msg__=False, *args, **kwargs):
-        if __raw_msg__:
+    def __init__(self, key, raw_msg=False, *args, **kwargs):
+        if raw_msg:
             msg = key
         else:
             msg = moulinette.m18n.g(key, *args, **kwargs)