diff --git a/lisp/frame.el b/lisp/frame.el
index 7b57aa3df1f..f8aa5c6e523 100644
--- a/lisp/frame.el
+++ b/lisp/frame.el
@@ -2438,7 +2438,7 @@ See also `toggle-frame-maximized'."
     ;; Manipulating a frame without waiting for the fullscreen
     ;; animation to complete can cause a crash, or other unexpected
     ;; behaviour, on macOS (bug#28496).
-    (when (featurep 'cocoa) (sit-for 1))))
+    (when (featurep 'cocoa) (sleep-for 0.5))))
 
 ;;;; Key bindings