diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 33a22975..099f1ab1 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -3257,6 +3257,7 @@ XQuery:
   ace_mode: xquery
 
 XS:
+  type: programming
   extensions:
   - .xs
   tm_scope: source.c