diff --git a/plugin/fugitive.vim b/plugin/fugitive.vim
index 23ceb97..3a93333 100644
--- a/plugin/fugitive.vim
+++ b/plugin/fugitive.vim
@@ -690,6 +690,7 @@ augroup fugitive
 
   autocmd BufNewFile,BufReadPost *  call FugitiveDetect(+expand('<abuf>'), 0)
   autocmd FileType           netrw  call FugitiveDetect(+expand('<abuf>'), 0)
+  autocmd BufFilePost            *  unlet! b:git_dir
 
   autocmd FileType git
         \ call fugitive#MapCfile()