diff --git a/lisp/mouse.el b/lisp/mouse.el
index a527b040d8a..f4f531959b7 100644
--- a/lisp/mouse.el
+++ b/lisp/mouse.el
@@ -908,7 +908,6 @@ at the same position."
       (track-mouse
 	(while (progn
 		 (setq event (read-event))
-		 (setq mve (cons event (and (boundp 'mve) mve)))
 		 (or (mouse-movement-p event)
 		     (memq (car-safe event) '(switch-frame select-window))))
 	  (if (memq (car-safe event) '(switch-frame select-window))