diff --git a/plugin/fugitive.vim b/plugin/fugitive.vim
index 4a24b5d..e7efc4f 100644
--- a/plugin/fugitive.vim
+++ b/plugin/fugitive.vim
@@ -2152,7 +2152,7 @@ function! s:BufWriteIndexFile()
     endif
     let info = old_mode.' '.sha1.' '.stage."\t".path
     call writefile([info],tmp)
-    if has('win32')
+    if &shell =~# 'cmd'
       let error = system('type '.s:gsub(tmp,'/','\\').'|'.s:repo().git_command('update-index','--index-info'))
     else
       let error = system(s:repo().git_command('update-index','--index-info').' < '.tmp)