1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/calendar/appt.el b/lisp/calendar/appt.el
index 623d94cd96a..8c8076a8413 100644
--- a/lisp/calendar/appt.el
+++ b/lisp/calendar/appt.el
@@ -381,7 +381,7 @@ The following variables control appointment notification:
   (if (equal (selected-window) (minibuffer-window))
       (if (other-window 1) 
           (select-window (other-window 1))
-        (if window-system
+        (if (display-multi-frame-p)
             (select-frame (other-frame 1)))))
       
   (let* ((this-buffer (current-buffer))