diff --git a/aiobotocore/endpoint.py b/aiobotocore/endpoint.py
index c77b2a46..621a8a18 100644
--- a/aiobotocore/endpoint.py
+++ b/aiobotocore/endpoint.py
@@ -45,6 +45,7 @@ def __getattr__(self, item):
     def __dir__(self):
         attrs = dir(self.__content)
         attrs.append('close')
+        return attrs
 
     def close(self):
         self.__response.close()