diff --git a/content/post/math-typesetting.mmark b/content/post/math-typesetting.md
similarity index 99%
rename from content/post/math-typesetting.mmark
rename to content/post/math-typesetting.md
index 7f421ae1..a1467e32 100644
--- a/content/post/math-typesetting.mmark
+++ b/content/post/math-typesetting.md
@@ -3,7 +3,6 @@ author: Hugo Authors
 title: Math Typesetting
 date: 2019-03-08
 description: A brief guide to setup KaTeX
-markup: mmark
 math: true
 ---