diff --git a/src/Config.py b/src/Config.py
index b5d27ea9..611b5b7b 100644
--- a/src/Config.py
+++ b/src/Config.py
@@ -18,5 +18,5 @@ class Config(object):
     def get(self, key, default=None):
         return self._config.get(key, default)
     def __contains__(self, key):
-        return key in self.config
+        return key in self._config