diff --git a/src/testdir/test_search.vim b/src/testdir/test_search.vim
index be8b9a4..37661c3 100644
--- a/src/testdir/test_search.vim
+++ b/src/testdir/test_search.vim
@@ -697,3 +697,7 @@
   call term_sendkeys(g:buf, ":qa!\<cr>")
   bwipe!
 endfunc
+
+func Test_search_undefined_behaviour2()
+  call search("\%UC0000000")
+endfunc
diff --git a/src/version.c b/src/version.c
index e94b81a..65f5a4b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1257,
+/**/
     1256,
 /**/
     1255,