diff --git a/app/code/core/Mage/Catalog/Model/Product/Type/Price.php b/app/code/core/Mage/Catalog/Model/Product/Type/Price.php
index 1775209246e..917c8d1b50e 100644
--- a/app/code/core/Mage/Catalog/Model/Product/Type/Price.php
+++ b/app/code/core/Mage/Catalog/Model/Product/Type/Price.php
@@ -269,8 +269,12 @@ protected function _getCustomerGroupId($product)
      */
     protected function _applySpecialPrice($product, $finalPrice)
     {
-        return $this->calculateSpecialPrice($finalPrice, $product->getSpecialPrice(), $product->getSpecialFromDate(),
-                        $product->getSpecialToDate(), $product->getStore()
+        return static::calculateSpecialPrice(
+            $finalPrice,
+            $product->getSpecialPrice(),
+            $product->getSpecialFromDate(),
+            $product->getSpecialToDate(),
+            $product->getStore()
         );
     }