diff --git a/lisp/window.el b/lisp/window.el
index f42784388f5..1f7ae726f49 100644
--- a/lisp/window.el
+++ b/lisp/window.el
@@ -5574,7 +5574,7 @@ anything else."
 
       (setq kill-from-mode
 	    (or (eq quit-window-kill-buffer t)
-		(and (listp quit-window-kill-buffer)
+                (and (consp quit-window-kill-buffer)
 		     (derived-mode-p quit-window-kill-buffer)))))
 
     (quit-restore-window