diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index edd03e3..917e89f 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -1637,6 +1637,7 @@
   endif
 
   let lines =<< trim END
+      set title
       edit Xa.txt
       let g:buf = bufadd('Xb.txt')
       inoremap <F2> <C-R>=setbufvar(g:buf, '&autoindent', 1) ?? ''<CR>