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 31786f42a43..a504bd4ce57 100644
--- a/app/code/core/Mage/Catalog/Model/Product/Type/Price.php
+++ b/app/code/core/Mage/Catalog/Model/Product/Type/Price.php
@@ -283,7 +283,7 @@ protected function _getCustomerGroupId($product)
      */
     protected function _applySpecialPrice($product, $finalPrice)
     {
-        return $this->calculateSpecialPrice(
+        return static::calculateSpecialPrice(
             $finalPrice,
             $product->getSpecialPrice(),
             $product->getSpecialFromDate(),