1 files changed, 1 insertions, 1 deletions

diff --git a/src/window.c b/src/window.c
index beabc28cf6d..f4f6e3c2eee 100644
--- a/src/window.c
+++ b/src/window.c
@@ -3263,7 +3263,7 @@ make_parent_window (Lisp_Object window, int horflag)
   p = allocate_window ();
   memcpy ((char *) p + sizeof (struct vectorlike_header),
           (char *) o + sizeof (struct vectorlike_header),
-          sizeof (Lisp_Object) * VECSIZE (struct window));
+          word_size * VECSIZE (struct window));
   XSETWINDOW (parent, p);
 
   p->sequence_number = ++sequence_number;