diff --git a/src/base/layer/layer.popover.js b/src/base/layer/layer.popover.js
index bce738ef3..6b37e8033 100644
--- a/src/base/layer/layer.popover.js
+++ b/src/base/layer/layer.popover.js
@@ -159,9 +159,8 @@ BI.Popover = BI.inherit(BI.Widget, {
         var self = this;
         var o = this.options;
         this.dragger.element.mousedown(function (e) {
-            var pos = self.element.offset();
-            self.startX = pos.left;
-            self.startY = pos.top;
+            self.startX = self.element[0].offsetLeft;
+            self.startY = self.element[0].offsetTop;
             self.tracker.captureMouseMoves(e);
         });
     },