diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 98c9f3ef..43d57594 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -2769,6 +2769,7 @@ Ruby:
   - .rbw
   - .rbx
   - .ru
+  - .ruby
   - .thor
   - .watchr
   interpreters: