diff --git a/app/code/core/Mage/Catalog/Model/Product.php b/app/code/core/Mage/Catalog/Model/Product.php
index 4752982a5ec..6ed5dfebf87 100644
--- a/app/code/core/Mage/Catalog/Model/Product.php
+++ b/app/code/core/Mage/Catalog/Model/Product.php
@@ -2272,6 +2272,9 @@ protected function _clearData()
         $this->_options             = array();
         $this->_canAffectOptions    = false;
         $this->_errors              = array();
+        $this->_defaultValues       = array();
+        $this->_storeValuesFlags    = array();
+        $this->_lockedAttributes    = array();
 
         return $this;
     }