diff --git a/autoload/airline/extensions/tabline/buffers.vim b/autoload/airline/extensions/tabline/buffers.vim
index ea19df1..d6993d3 100644
--- a/autoload/airline/extensions/tabline/buffers.vim
+++ b/autoload/airline/extensions/tabline/buffers.vim
@@ -58,7 +58,6 @@ function! airline#extensions#tabline#buffers#get()
     endif
   endif
 
-  let index = 1
   let b = airline#extensions#tabline#new_builder()
   let tab_bufs = tabpagebuflist(tabpagenr())
   let show_buf_label_first = 0
@@ -116,9 +115,9 @@ function! airline#extensions#tabline#buffers#get()
 
     if get(g:, 'airline#extensions#tabline#buffer_idx_mode', 0)
       if len(s:number_map) > 0
-        return space. get(s:number_map, a:i, '') . '%(%{airline#extensions#tabline#get_buffer_name('.bufnum.')}%)' . s:spc
+        return space. get(s:number_map, a:i+1, '') . '%(%{airline#extensions#tabline#get_buffer_name('.bufnum.')}%)' . s:spc
       else
-        return '['.a:i.s:spc.'%(%{airline#extensions#tabline#get_buffer_name('.bufnum.')}%)'.']'
+        return '['.(a:i+1).s:spc.'%(%{airline#extensions#tabline#get_buffer_name('.bufnum.')}%)'.']'
       endif
     else
       return space.'%(%{airline#extensions#tabline#get_buffer_name('.bufnum.')}%)'.s:spc