diff --git a/autoload/airline.vim b/autoload/airline.vim
index 1411941..81e5670 100644
--- a/autoload/airline.vim
+++ b/autoload/airline.vim
@@ -28,19 +28,21 @@ function! airline#get_statusline(winnr, active)
   let builder = airline#builder#new(a:active, s:highlighter)
 
   if airline#util#getwinvar(a:winnr, 'airline_render_left', a:active || (!a:active && !g:airline_inactive_collapse))
-    call builder.add_section('a', s:get_section(a:winnr, 'a').'%{g:airline_detect_paste && &paste ? g:airline_paste_symbol." " : ""}')
-    call builder.add_section('b', s:get_section(a:winnr, 'b'))
-    call builder.add_section('c', s:get_section(a:winnr, 'c').' %#airline_file#%{&ro ? g:airline_readonly_symbol : ""}')
+    call builder.add_section('airline_a', s:get_section(a:winnr, 'a')
+          \ .'%{g:airline_detect_paste && &paste ? g:airline_paste_symbol." " : ""}')
+    call builder.add_section('airline_b', s:get_section(a:winnr, 'b'))
+    call builder.add_section('airline_c', s:get_section(a:winnr, 'c')
+          \ .'%#airline_file#%{&ro ? g:airline_readonly_symbol : ""}')
   else
-    call builder.add_section('c', '%f%m')
+    call builder.add_section('airline_c', '%f%m')
   endif
 
   call builder.split(s:get_section(a:winnr, 'gutter', '', ''))
 
   if airline#util#getwinvar(a:winnr, 'airline_render_right', 1)
-    call builder.add_section('c', s:get_section(a:winnr, 'x'))
-    call builder.add_section('b', s:get_section(a:winnr, 'y'))
-    call builder.add_section('a', s:get_section(a:winnr, 'z'))
+    call builder.add_section('airline_c', s:get_section(a:winnr, 'x'))
+    call builder.add_section('airline_b', s:get_section(a:winnr, 'y'))
+    call builder.add_section('airline_a', s:get_section(a:winnr, 'z'))
     if a:active
       call builder.add_raw('%(')
       call builder.add_section('warningmsg', s:get_section(a:winnr, 'warning', '', ''))
diff --git a/autoload/airline/builder.vim b/autoload/airline/builder.vim
index d35ae92..2e8226d 100644
--- a/autoload/airline/builder.vim
+++ b/autoload/airline/builder.vim
@@ -8,7 +8,7 @@ function! s:prototype.split(gutter)
 endfunction
 
 function! s:prototype.add_section(group, contents)
-  call add(self._sections, ['airline_'.a:group, a:contents])
+  call add(self._sections, [a:group, a:contents])
 endfunction
 
 function! s:prototype.add_raw(text)
diff --git a/autoload/airline/util.vim b/autoload/airline/util.vim
index daa3ea8..483b1e2 100644
--- a/autoload/airline/util.vim
+++ b/autoload/airline/util.vim
@@ -1,11 +1,16 @@
 " MIT License. Copyright (c) 2013 Bailey Ling.
 " vim: et ts=2 sts=2 sw=2
 
-" for 7.2 compatibility
-function! airline#util#getwinvar(winnr, key, ...)
-  let winvals = getwinvar(a:winnr, '')
-  return get(winvals, a:key, (a:0 ? a:1 : ''))
-endfunction
+if v:version >= 703
+  function! airline#util#getwinvar(winnr, key, def)
+    return getwinvar(a:winnr, a:key, a:def)
+  endfunction
+else
+  function! airline#util#getwinvar(winnr, key, def)
+    let winvals = getwinvar(a:winnr, '')
+    return get(winvals, a:key, def)
+  endfunction
+endif
 
 function! airline#util#exec_funcrefs(list, break_early)
   " for 7.2; we cannot iterate list, hence why we use range()