diff --git a/src/frontend/plotting/plotit.c b/src/frontend/plotting/plotit.c
index f23f46002..b37b7d7ba 100644
--- a/src/frontend/plotting/plotit.c
+++ b/src/frontend/plotting/plotit.c
@@ -279,6 +279,7 @@ plotit(wordlist *wl, char *hcopy, char *devname)
      */
     if(wl->wl_prev) {
 	wl = wl->wl_prev;
+	tw = NULL;  /* Not used, so must be NULL */
     } else {
 	tw = alloc(struct wordlist);
 	wl->wl_prev = tw;