diff --git a/satysfi-ts-mode.el b/satysfi-ts-mode.el
index 2cd12b8..8901b13 100644
--- a/satysfi-ts-mode.el
+++ b/satysfi-ts-mode.el
@@ -302,8 +302,8 @@
   
   (when (treesit-ready-p 'satysfi)
     (add-hook 'satysfi-ts-mode-hook (lambda () (setq comment-start "%") (setq comment-continue "") (setq comment-end "")))
-    (add-to-list 'auto-mode-alist '("\\.saty$'" . satysfi-ts-mode))
-    (add-to-list 'auto-mode-alist '("\\.satyh$'" . satysfi-ts-mode))))
+    (add-to-list 'auto-mode-alist '("\\.saty\\'" . satysfi-ts-mode))
+    (add-to-list 'auto-mode-alist '("\\.satyh\\'" . satysfi-ts-mode))))
 
 (provide 'satysfi-ts-mode)
 ;;; satysfi-ts-mode.el ends here