diff --git a/src/offset.js b/src/offset.js
index 3c63aae920..f59fb9b27c 100644
--- a/src/offset.js
+++ b/src/offset.js
@@ -13,7 +13,7 @@ jQuery.fn.offset = function() {
 	
 		// Use getBoundingClientRect if available
 		if ( elem.getBoundingClientRect ) {
-			box = elem.getBoundingClientRect();
+			var box = elem.getBoundingClientRect();
 		
 			// Add the document scroll offsets
 			add(