diff --git a/src/undo.c b/src/undo.c
index 8646b46..c16f2af 100644
--- a/src/undo.c
+++ b/src/undo.c
@@ -3121,7 +3121,8 @@
      * all the pointers. */
     if (uhp == buf->b_u_oldhead)
     {
-	u_freeheader(buf, uhp, uhpp);
+	while (buf->b_u_oldhead != NULL)
+	    u_freeheader(buf, buf->b_u_oldhead, uhpp);
 	return;
     }