diff --git a/tests/test_parameter_plots.py b/tests/test_parameter_plots.py
index d002c0126..14a4fc387 100644
--- a/tests/test_parameter_plots.py
+++ b/tests/test_parameter_plots.py
@@ -1,6 +1,7 @@
 """
 Tests of parameter_plots.py module
 """
+
 import pytest
 import os
 import sys