diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 41dd26ed..a9f18de5 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -3202,6 +3202,7 @@ fish:
   extensions:
   - .fish
   tm_scope: source.fish
+  ace_mode: none
 
 mupad:
   extensions: