diff --git a/autoload/zencoding/lang/html.vim b/autoload/zencoding/lang/html.vim
index fb58383..7e79300 100644
--- a/autoload/zencoding/lang/html.vim
+++ b/autoload/zencoding/lang/html.vim
@@ -321,7 +321,7 @@ function! zencoding#lang#html#toString(settings, current, type, inline, filters,
   if len(current_name) > 0
   let str .= '<' . current_name
   for attr in current.attrs_order
-    if has_key(current.attr, attr)
+    if !has_key(current.attr, attr)
       continue
     endif
     let val = current.attr[attr]