diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index eed077e..6b9ef03 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -6771,9 +6771,13 @@ function! s:BlameSubcommand(line1, count, range, bang, mods, options) abort
     elseif empty(files) && len(matchstr(s:DirCommitFile(@%)[1], '^\x\x\+$'))
       let cmd += [matchstr(s:DirCommitFile(@%)[1], '^\x\x\+$')]
     elseif empty(files) && !s:HasOpt(flags, '--reverse')
-      let cmd += ['--contents', tempname . '.in']
-      silent execute 'noautocmd keepalt %write ' . s:fnameescape(tempname . '.in')
-      let delete_in = 1
+      if &modified
+        let cmd += ['--contents', tempname . '.in']
+        silent execute 'noautocmd keepalt %write ' . s:fnameescape(tempname . '.in')
+        let delete_in = 1
+      elseif &autoread
+        exe 'checktime ' . bufnr('')
+      endif
     else
       call fugitive#Autowrite()
     endif