diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index b0189a4..907476f 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -42,7 +42,7 @@ function! s:Uniq(list) abort
 endfunction
 
 function! s:winshell() abort
-  return has('win32') && &shellcmdflag !~# '^-'
+  return has('win32') && &shellcmdflag =~# '^/\|^-Command$'
 endfunction
 
 function! s:shellesc(arg) abort