diff --git a/docs/sphinx/conf.py b/docs/sphinx/conf.py
index 6f9bb80b..20d1f7a2 100644
--- a/docs/sphinx/conf.py
+++ b/docs/sphinx/conf.py
@@ -49,7 +49,7 @@
     "sphinx_immaterial",
     "sphinx.ext.intersphinx",
     "sphinx.ext.autosectionlabel",
-    "sphinx_immaterial.cppreference",
+    "sphinx_immaterial.apidoc.cpp.cppreference",
 ]
 
 # auto-reference links (using intersphinx extension)