diff --git a/src/base/single/single.js b/src/base/single/single.js
index a4c9c46b0..d2b51f0d0 100644
--- a/src/base/single/single.js
+++ b/src/base/single/single.js
@@ -13,7 +13,6 @@ BI.Single = BI.inherit(BI.Widget, {
     _defaultConfig: function () {
         var conf = BI.Single.superclass._defaultConfig.apply(this, arguments);
         return BI.extend(conf, {
-            _baseCls: (conf._baseCls || "") + " bi-single",
             readonly: false,
             title: null,
             warningTitle: null,
@@ -207,4 +206,4 @@ BI.Single = BI.inherit(BI.Widget, {
         }
         BI.Tooltips.remove(this.getName());
     },
-});
\ No newline at end of file
+});