diff --git a/thriftpy2/hook.py b/thriftpy2/hook.py
index 12c85d6..2ae383b 100644
--- a/thriftpy2/hook.py
+++ b/thriftpy2/hook.py
@@ -34,7 +34,7 @@ def create_module(self, spec):
             return load_module(self.fullname)
 
         def exec_module(self, module):
-            ...
+            pass
 else:
     class ThriftImporter(object):
         def __init__(self, extension="_thrift"):