diff --git a/tools/perftests_ci/perftest/html.py b/tools/perftests_ci/perftest/html.py
index 3f5dcaec3..eb10eac21 100644
--- a/tools/perftests_ci/perftest/html.py
+++ b/tools/perftests_ci/perftest/html.py
@@ -5,6 +5,7 @@
 Distributed under the Boost Software License, Version 1.0. (See accompanying
 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 """
+
 import contextlib
 import os
 import pathlib