diff --git a/src/offset.js b/src/offset.js
index f0adae04d..1ae3f2e2f 100644
--- a/src/offset.js
+++ b/src/offset.js
@@ -132,7 +132,7 @@ jQuery.fn.extend({
 	},
 
 	offsetParent: function() {
-		var offsetParent = this[0].offsetParent;
+		var offsetParent = this[0].offsetParent || document.body;
 		while ( offsetParent && (!/^body|html$/i.test(offsetParent.tagName) && jQuery.css(offsetParent, 'position') == 'static') )
 			offsetParent = offsetParent.offsetParent;
 		return jQuery(offsetParent);