diff --git a/test/test_parallel.py b/test/test_parallel.py
index 2073586c..1e00b38d 100644
--- a/test/test_parallel.py
+++ b/test/test_parallel.py
@@ -1,4 +1,5 @@
 """Test for parallel build."""
+
 import os
 
 from sphinx.util.parallel import parallel_available