diff --git a/elixir-mode.el b/elixir-mode.el
index 5b15fe4c..1751823e 100644
--- a/elixir-mode.el
+++ b/elixir-mode.el
@@ -562,9 +562,9 @@ Argument END End of the region."
 
 ;;;###autoload
 (progn
-  (add-to-list 'auto-mode-alist '("\\.elixir\'" . elixir-mode))
-  (add-to-list 'auto-mode-alist '("\\.ex\'" . elixir-mode))
-  (add-to-list 'auto-mode-alist '("\\.exs\'" . elixir-mode)))
+  (add-to-list 'auto-mode-alist '("\\.elixir\\'" . elixir-mode))
+  (add-to-list 'auto-mode-alist '("\\.ex\\'" . elixir-mode))
+  (add-to-list 'auto-mode-alist '("\\.exs\\'" . elixir-mode)))
 
 (provide 'elixir-mode)
 ;;; elixir-mode.el ends here