diff --git a/Lib/test/test_pyclbr.py b/Lib/test/test_pyclbr.py
index 87572ca..d2f8c76 100644
--- a/Lib/test/test_pyclbr.py
+++ b/Lib/test/test_pyclbr.py
@@ -95,6 +95,9 @@
                 self.assert_(isinstance(py_item, (FunctionType, BuiltinFunctionType)))
             else:
                 self.failUnless(isinstance(py_item, (ClassType, type)))
+                if py_item.__module__!=moduleName:
+                    continue   # skip classes that came from somewhere else
+
                 real_bases = [base.__name__ for base in py_item.__bases__]
                 pyclbr_bases = [ getattr(base, 'name', base)
                                  for base in value.super ]