diff --git a/docs/conf.py b/docs/conf.py
index a36009e37b..c08ed8d095 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -81,7 +81,7 @@ def generate_draft_news():
 html_sidebars = {
     "**": ["about.html", "localtoc.html", "relations.html", "searchbox.html", "donate.html"],
 }
-html_favicon = '_static/img/toxfavi.ico'
+html_favicon = "_static/img/toxfavi.ico"
 html_show_sourcelink = False
 html_static_path = ["_static"]
 htmlhelp_basename = "{}doc".format(project)