diff --git a/source/Ox/js/Collection.js b/source/Ox/js/Collection.js
index d8711a66..5a355dc6 100644
--- a/source/Ox/js/Collection.js
+++ b/source/Ox/js/Collection.js
@@ -663,7 +663,7 @@ Ox.sum = function(col) {
     col = arguments.length > 1 ? Ox.toArray(arguments) : col;
     Ox.forEach(col, function(val) {
         val = +val;
-        sum += Ox.isNumber(val) ? val : 0;
+        sum += isFinite(val) ? val : 0;
     });
     return sum;
 };