diff --git a/testtools/testcase.py b/testtools/testcase.py
index 012def36..f3bd510b 100644
--- a/testtools/testcase.py
+++ b/testtools/testcase.py
@@ -275,6 +275,8 @@ def __eq__(self, other):
             return False
         return self.__dict__ == other.__dict__
 
+    __hash__ = unittest.TestCase.__hash__
+
     def __repr__(self):
         # We add id to the repr because it makes testing testtools easier.
         return f"<{self.id()} id=0x{id(self):0x}>"
diff --git a/testtools/tests/test_testcase.py b/testtools/tests/test_testcase.py
index 00cb60da..c2766ffd 100644
--- a/testtools/tests/test_testcase.py
+++ b/testtools/tests/test_testcase.py
@@ -86,6 +86,10 @@ def test_shortDescription_specified(self):
         test = PlaceHolder("test id", "description")
         self.assertEqual("description", test.shortDescription())
 
+    def test_testcase_is_hashable(self):
+        test = hash(self)
+        self.assertEqual(unittest.TestCase.__hash__(self), test)
+
     def test_repr_just_id(self):
         # repr(placeholder) shows you how the object was constructed.
         test = PlaceHolder("test id")