diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index 1c19bf3..94b115d 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -3877,7 +3877,7 @@ call s:command("-bang -nargs=? -range=-1 -addr=other -complete=customlist,s:LogC
 " Section: :Gedit, :Gpedit, :Gsplit, :Gvsplit, :Gtabedit, :Gread
 
 function! s:UsableWin(nr) abort
-  return a:nr && !getwinvar(a:nr, '&previewwindow') &&
+  return a:nr && !getwinvar(a:nr, '&previewwindow') && !getwinvar(a:nr, '&winfixwidth')
         \ (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