diff --git a/lisp/time.el b/lisp/time.el
index d889a7c7531..63bc23c459b 100644
--- a/lisp/time.el
+++ b/lisp/time.el
@@ -32,6 +32,8 @@
 
 ;;; Code:
 
+(eval-when-compile (require 'time-date))
+
 (defgroup display-time nil
   "Display time and load in mode line of Emacs."
   :group 'mode-line