diff --git a/tests/test_mock_pin.py b/tests/test_mock_pin.py
index 77b0c46..d5262ff 100644
--- a/tests/test_mock_pin.py
+++ b/tests/test_mock_pin.py
@@ -24,7 +24,7 @@ def test_mock_pin_init():
     assert MockPin(2).number == 2
 
 def test_mock_pin_frequency_unsupported():
-    with pytest.raises(AttributeError):
+    with pytest.raises(PinPWMUnsupported):
         pin = MockPin(3)
         pin.frequency = 100