diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index ecde485..1423a14 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -2876,7 +2876,7 @@ endfunction
 
 function! s:UsableWin(nr) abort
   return a:nr && !getwinvar(a:nr, '&previewwindow') &&
-        \ (empty(getwinvar(a:nr, 'fugitive_status')) || getwinvar(a:nr, 'fugitive_type') !=# 'index') &&
+        \ (empty(getwinvar(a:nr, 'fugitive_status')) || getbufvar(winbufnr(a:nr), 'fugitive_type') !=# 'index') &&
         \ index(['gitrebase', 'gitcommit'], getbufvar(winbufnr(a:nr), '&filetype')) < 0 &&
         \ index(['nofile','help','quickfix'], getbufvar(winbufnr(a:nr), '&buftype')) < 0
 endfunction