diff --git a/src/testdir/test_autocmd.vim b/src/testdir/test_autocmd.vim
index 15aab48..d0b5b5a 100644
--- a/src/testdir/test_autocmd.vim
+++ b/src/testdir/test_autocmd.vim
@@ -2108,12 +2108,15 @@
   exe 'lcd ' .. fnameescape(s:dir_bar)
   call assert_equal(expected, s:li)
 
+  let save_shellslash = &shellslash
+  set shellslash
   exe 'cd ' .. s:dir_foo
   exe 'cd ' .. s:dir_bar
   autocmd! test_dirchanged DirChanged global let g:result = expand("<afile>")
   cd -
   call assert_equal(s:dir_foo, g:result)
 
+  let &shellslash = save_shellslash
   call s:After_test_dirchanged()
 endfunc