diff --git a/autoload/zencoding/lang/css.vim b/autoload/zencoding/lang/css.vim
index 4f1e865..a7664de 100644
--- a/autoload/zencoding/lang/css.vim
+++ b/autoload/zencoding/lang/css.vim
@@ -43,6 +43,8 @@ function! zencoding#lang#css#parseIntoTree(abbr, type)
           let value .= v . 'em'
         elseif v == 'auto'
           let value .= v
+        elseif v == '0'
+          let value .= '0'
         else
           let value .= v . 'px'
         endif
diff --git a/unittest.vim b/unittest.vim
index 8bafee0..c604c37 100644
--- a/unittest.vim
+++ b/unittest.vim
@@ -614,7 +614,7 @@ finish
         },
         {
           'query': "m10-5-0$$$$",
-          'result': "margin: 10px 5px 0px;",
+          'result': "margin: 10px 5px 0;",
         },
         {
           'query': "m-10--5$$$$",
@@ -638,7 +638,7 @@ finish
         },
         {
           'query': "m0+bgi+bg++p0$$$$",
-          'result': "margin: 0px;\nbackground-image: url($$$$);\nbackground: #FFF url() 0 0 no-repeat;\npadding: 0px;",
+          'result': "margin: 0;\nbackground-image: url($$$$);\nbackground: #FFF url() 0 0 no-repeat;\npadding: 0;",
         },
       ],
     },
@@ -862,7 +862,7 @@ finish
         },
         {
           'query': "m10-5-0$$$$",
-          'result': "margin:10px 5px 0px",
+          'result': "margin:10px 5px 0",
         },
         {
           'query': "m-10--5$$$$",