diff --git a/doc/conf.py b/doc/conf.py
index d8508890..6a34f36d 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -216,8 +216,8 @@ def skip(app, what, name, obj, would_skip, options):
     return would_skip
 
 def setup(app):
-    app.add_stylesheet('css/custom.css')
-    app.add_stylesheet('css/pygments.css')
+    app.add_css_file('css/custom.css')
+    app.add_css_file('css/pygments.css')
     app.connect("autodoc-skip-member", skip)