diff --git a/eval-mark.el b/eval-mark.el
index 70a2091..6c4c0c7 100644
--- a/eval-mark.el
+++ b/eval-mark.el
@@ -6,7 +6,7 @@
 ;; Maintainer: Shen, Jen-Chieh <jcs090218@gmail.com>
 ;; URL: https://github.com/jcs-elpa/eval-mark
 ;; Version: 0.1.0
-;; Package-Requires: ((emacs "26.1"))
+;; Package-Requires: ((emacs "26.1") (msgu "0.1.0"))
 ;; Keywords: lisp
 
 ;; This file is not part of GNU Emacs.
@@ -31,6 +31,8 @@
 
 ;;; Code:
 
+(eval-when-compile (require 'msgu))
+
 (defgroup eval-mark nil
   "Evaluate then deactive mark."
   :prefix "eval-mark-"