diff --git a/doc/conf.py b/doc/conf.py
index 2ab2d08c0..8d4575238 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -53,7 +53,7 @@
     'nbsphinx',
     'sphinx_copybutton',
     'sphinx_tabs.tabs',
-    'sphinx_design',,
+    'sphinx_design',
     'sphinx.ext.mathjax',
 ]