diff --git a/plugin/gitgutter.vim b/plugin/gitgutter.vim
index 81dcc9c..008724e 100644
--- a/plugin/gitgutter.vim
+++ b/plugin/gitgutter.vim
@@ -247,6 +247,8 @@ function! s:on_bufenter()
   if has('vim_starting') && !$VIM_GITGUTTER_TEST
     if exists('*timer_start') && has('lambda')
       call s:next_tick("call gitgutter#process_buffer(+".bufnr('').", 0)")
+    else
+      call gitgutter#process_buffer(bufnr(''), 0)
     endif
     return
   endif