diff --git a/Helper/Data.php b/Helper/Data.php
index 14bfe06..8e8c27e 100755
--- a/Helper/Data.php
+++ b/Helper/Data.php
@@ -151,7 +151,7 @@ public function getAccountId($store_id = null)
      * @param $price
      * @return float
      */
-    public static function formatPrice($price)
+    public function formatPrice($price)
     {
         return (float)sprintf('%.2F', $price);
     }