diff --git a/src/nvim/testdir/test_search.vim b/src/nvim/testdir/test_search.vim
index 50be1f83e6..42c56dced7 100644
--- a/src/nvim/testdir/test_search.vim
+++ b/src/nvim/testdir/test_search.vim
@@ -468,3 +468,7 @@ func Test_search_undefined_behaviour()
   call term_sendkeys(g:buf, ":qa!\<cr>")
   bwipe!
 endfunc
+
+func Test_search_undefined_behaviour2()
+  call search("\%UC0000000")
+endfunc