diff --git a/tests/test_base.py b/tests/test_base.py
index dbbbd15..95fbcb9 100644
--- a/tests/test_base.py
+++ b/tests/test_base.py
@@ -1,5 +1,7 @@
 # -*- coding: utf-8 -*-
 
+import pytest
+
 import thriftpy
 from thriftpy.thrift import parse_spec, TType
 
@@ -28,10 +30,11 @@ def test_isinstancecheck():
     assert isinstance(ab.PersonNotExistsError(), ab2.PersonNotExistsError)
 
 
-def test_hashable():
+def test_unhashable():
     ab = thriftpy.load("addressbook.thrift")
 
-    hash(ab.Person(name="Tom"))
+    with pytest.raises(TypeError):
+        hash(ab.Person(name="Tom"))
 
 
 def test_default_value():
diff --git a/thriftpy/thrift.py b/thriftpy/thrift.py
index 1bb87f9..6538d6c 100644
--- a/thriftpy/thrift.py
+++ b/thriftpy/thrift.py
@@ -122,7 +122,7 @@ def __eq__(self, other):
             self.__dict__ == other.__dict__
 
     def __hash__(self):
-        return super(TPayload, self).__hash__()
+        raise TypeError("unhashable type: 'thriftpy.thrift.TPayload'")
 
     def __ne__(self, other):
         return not self.__eq__(other)