diff --git a/extra/sass-mode.el b/extra/sass-mode.el
index 033fe9dd..50c17d88 100644
--- a/extra/sass-mode.el
+++ b/extra/sass-mode.el
@@ -8,6 +8,7 @@
 ;; Created: 2007-03-15
 ;; By: Nathan Weizenbaum
 ;; Keywords: markup, language, css
+;; Package-Requires: ((haml-mode "2.2.5"))
 
 ;;; Commentary: