diff --git a/test/test_format.py b/test/test_format.py
index 34e65ac..4cb96f3 100644
--- a/test/test_format.py
+++ b/test/test_format.py
@@ -5,7 +5,9 @@
 import pylsl
 
 
-@pytest.mark.parametrize("channel_format", [pylsl.cf_int32, pylsl.cf_float32, pylsl.cf_double64])
+@pytest.mark.parametrize(
+    "channel_format", [pylsl.cf_int32, pylsl.cf_float32, pylsl.cf_double64]
+)
 def test_format(channel_format: int):
     expected_type = {
         pylsl.cf_int32: ctypes.c_int,