diff --git a/flare/src/flare/query/methods/pctchange.as b/flare/src/flare/query/methods/pctchange.as
index 21f499b..13b264a 100644
--- a/flare/src/flare/query/methods/pctchange.as
+++ b/flare/src/flare/query/methods/pctchange.as
@@ -14,6 +14,6 @@ package flare.query.methods
    */
   public function pctchange(newval:*, oldval:*):Arithmetic
 	{
-		return Arithmetic.Divide(Arithmetic.Subtract(newval, oldval), oldval);
+		return Arithmetic.Divide(Arithmetic.Subtract(sum(newval), sum(oldval)), sum(oldval));
 	}
 }
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