diff --git a/plugin/fugitive.vim b/plugin/fugitive.vim
index 5853526..fa33917 100644
--- a/plugin/fugitive.vim
+++ b/plugin/fugitive.vim
@@ -100,7 +100,7 @@ let s:abstract_prototype = {}
 " Initialization {{{1
 
 function! fugitive#is_git_dir(path) abort
-  let path = a:path . '/'
+  let path = s:sub(a:path, '[\/]$', '') . '/'
   return isdirectory(path.'objects') && isdirectory(path.'refs') && getfsize(path.'HEAD') > 10
 endfunction