diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index c02ebfea..75d30673 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -438,6 +438,7 @@ COBOL:
   ace_mode: cobol
 
 CSS:
+  type: markup
   ace_mode: css
   color: "#563d7c"
   extensions: