diff --git a/plugin/gitgutter.vim b/plugin/gitgutter.vim
index e7522a2a..90022949 100644
--- a/plugin/gitgutter.vim
+++ b/plugin/gitgutter.vim
@@ -398,7 +398,7 @@ endfunction
 function! GitGutterAll()
   let buffer_ids = g:gitgutter_on_bufenter ? s:visible_buffers() : s:buffers()
   for buffer_id in buffer_ids
-    call GitGutter(fnamemodify(bufname(buffer_id), ':p'))
+    call GitGutter(expand('#' . buffer_id . ':p'))
   endfor
 endfunction
 command GitGutterAll call GitGutterAll()