diff --git a/markdown/extensions/github.py b/markdown/extensions/github.py
index 898e48ae..bf8f245c 100644
--- a/markdown/extensions/github.py
+++ b/markdown/extensions/github.py
@@ -2,7 +2,6 @@
 from ..extensions import Extension
 
 extensions = [
-    'extra',
     'delete',
     'githubemoji',
     'magiclink',