diff --git a/docs/conf.py b/docs/conf.py
index 4c494ca..f65d848 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -452,4 +452,7 @@ def remove_hbox(filepath):
 # texinfo_no_detailmenu = False
 
 def setup(app):
-    app.add_stylesheet('style.css')
+    try:
+        app.add_stylesheet('style.css')
+    except:
+        app.add_css_file('style.css')