diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 80bd5832..e3d574bf 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1435,7 +1435,7 @@ TeX:
   - .ltx
   - .mkii
   - .mkiv
-  = .mkvi
+  - .mkvi
   - .sty
   - .toc