diff --git a/tests/pipeline/test_factor.py b/tests/pipeline/test_factor.py
index 3ea980872d..f2c798fbbb 100644
--- a/tests/pipeline/test_factor.py
+++ b/tests/pipeline/test_factor.py
@@ -1876,7 +1876,7 @@ def test_complex_expression(self, seed, mask):
         # 3. Mask by having non-True values in the root mask.
         mask_mode=("none", "param", "root"),
     )
-    @pytest.mark.skipif(sys.platform == "Darwin", reason="Test is flaky on macOS")
+    @pytest.mark.skipif(sys.platform == "darwin", reason="Test is flaky on macOS")
     def test_summaries_after_fillna(self, seed, mask, mask_mode):
         rand = np.random.RandomState(seed)
         shape = (10, 5)