diff --git a/autoload/airline/extensions/default.vim b/autoload/airline/extensions/default.vim
index c24a1f5..4ae686c 100644
--- a/autoload/airline/extensions/default.vim
+++ b/autoload/airline/extensions/default.vim
@@ -23,14 +23,18 @@ function! s:get_section(winnr, key, ...)
   return empty(text) ? '' : prefix.text.suffix
 endfunction
 
-function! s:build_sections(builder, keys, winnr)
+function! s:build_sections(builder, context, keys)
   for key in a:keys
+    if key == 'warning' && !a:context.active
+      continue
+    endif
+
     " i have no idea why the warning section needs special treatment, but it's
     " needed to prevent separators from showing up
     if key == 'warning'
       call a:builder.add_raw('%(')
     endif
-    call a:builder.add_section('airline_'.key, s:get_section(a:winnr, key))
+    call a:builder.add_section('airline_'.key, s:get_section(a:context.winnr, key))
     if key == 'warning'
       call a:builder.add_raw('%)')
     endif
@@ -42,7 +46,7 @@ function! airline#extensions#default#apply(builder, context)
   let active = a:context.active
 
   if airline#util#getwinvar(winnr, 'airline_render_left', active || (!active && !g:airline_inactive_collapse))
-    call <sid>build_sections(a:builder, s:layout[0], winnr)
+    call <sid>build_sections(a:builder, a:context, s:layout[0])
   else
     call a:builder.add_section('airline_a', '%f%m ')
     call a:builder.add_section('airline_c', '')
@@ -51,7 +55,7 @@ function! airline#extensions#default#apply(builder, context)
   call a:builder.split(s:get_section(winnr, 'gutter', '', ''))
 
   if airline#util#getwinvar(winnr, 'airline_render_right', 1)
-    call <sid>build_sections(a:builder, s:layout[1], winnr)
+    call <sid>build_sections(a:builder, a:context, s:layout[1])
   endif
 
   return 1