diff --git a/lisp/frame.el b/lisp/frame.el
index 5e6451dccac..8437475dfd6 100644
--- a/lisp/frame.el
+++ b/lisp/frame.el
@@ -695,7 +695,7 @@ automatically."
     (select-frame frame)
     (raise-frame frame)
     ;; Ensure, if possible, that frame gets input focus.
-    (cond ((eq window-system 'x)
+    (cond ((memq window-system '(x mac))
 	   (x-focus-frame frame))
 	  ((eq window-system 'w32)
 	   (w32-focus-frame frame)))