diff --git a/specreduce/tests/test_tracing.py b/specreduce/tests/test_tracing.py
index 44d4347..edc814e 100644
--- a/specreduce/tests/test_tracing.py
+++ b/specreduce/tests/test_tracing.py
@@ -181,7 +181,8 @@ def test_window_fit_trace(self):
         with pytest.raises(ValueError, match=r'image is fully masked'):
             FitTrace(img_all_nans)
 
-    @pytest.mark.filterwarnings("ignore:The fit may be unsuccessful; check fit_info['message'] for more information.")
+    @pytest.mark.filterwarnings("ignore:The fit may be unsuccessful;"
+                                "check fit_info['message'] for more information.")
     @pytest.mark.filterwarnings("ignore:Model is linear in parameters")
     def test_fit_trace_all_nan_columns(self):