diff --git a/tests/test_redis.py b/tests/test_redis.py
index 985dad93..54e49a03 100644
--- a/tests/test_redis.py
+++ b/tests/test_redis.py
@@ -48,7 +48,7 @@ def test_redis_with_signer(self, app_utils):
             'SESSION_USE_SIGNER': True,
         })
         # Without a secret key set, there should be an exception raised
-        with pytest.raises(AssertionError):
+        with pytest.raises(KeyError):
             app_utils.test_session_set(app)
 
         # With a secret key set, no exception should be thrown