diff --git a/source/Ox/js/DOM.js b/source/Ox/js/DOM.js
index 17c7d562..fbac6b2e 100644
--- a/source/Ox/js/DOM.js
+++ b/source/Ox/js/DOM.js
@@ -74,7 +74,7 @@ Ox.$ = Ox.element = function $(value) {
             other <o> Other DOM object
         @*/
         add: function add($other) {
-            elements = Ox.unique(elements.concat(other.elements()));
+            elements = Ox.unique(elements.concat($other.elements()));
             this.length = elements.length;
             return this;
         },