diff --git a/source/Ox/js/Array.js b/source/Ox/js/Array.js
index 71f4d1d1..403e3674 100644
--- a/source/Ox/js/Array.js
+++ b/source/Ox/js/Array.js
@@ -767,6 +767,7 @@ Ox.unique <f> Removes duplicate values from an array
     []
 @*/
 Ox.unique = function(array) {
+    array = Ox.slice(array);
     return Ox.filter(array, function(value, index) {
         return array.indexOf(value) == index;
     });