diff --git a/classes/SpecificPrice.php b/classes/SpecificPrice.php
index 11e67f1f5..0db0c487e 100644
--- a/classes/SpecificPrice.php
+++ b/classes/SpecificPrice.php
@@ -94,7 +94,7 @@ class SpecificPriceCore extends ObjectModel
 		if (parent::add($autodate, $nullValues))
 		{
 			// Flush cache when we adding a new specific price
-			self::$_specificPriceCache = array();
+			SpecificPrice::$_specificPriceCache = array();
 			Product::flushPriceCache();
 			// Set cache of feature detachable to true
 			Configuration::updateGlobalValue('PS_SPECIFIC_PRICE_FEATURE_ACTIVE', '1');
@@ -108,7 +108,7 @@ class SpecificPriceCore extends ObjectModel
 		if (parent::update($null_values))
 		{
 			// Flush cache when we updating a new specific price
-			self::$_specificPriceCache = array();
+			SpecificPrice::$_specificPriceCache = array();
 			Product::flushPriceCache();
 			return true;
 		}
@@ -120,7 +120,7 @@ class SpecificPriceCore extends ObjectModel
 		if (parent::delete())
 		{
 			// Flush cache when we deletind a new specific price
-			self::$_specificPriceCache = array();
+			SpecificPrice::$_specificPriceCache = array();
 			Product::flushPriceCache();
 			// Refresh cache of feature detachable
 			Configuration::updateGlobalValue('PS_SPECIFIC_PRICE_FEATURE_ACTIVE', SpecificPrice::isCurrentlyUsed($this->def['table']));
@@ -180,9 +180,9 @@ class SpecificPriceCore extends ObjectModel
 		if (!SpecificPrice::isFeatureActive())
 			return explode(';', Configuration::get('PS_SPECIFIC_PRICE_PRIORITIES'));
 
-		if (!isset(self::$_cache_priorities[(int)$id_product]))
+		if (!isset(SpecificPrice::$_cache_priorities[(int)$id_product]))
 		{
-			self::$_cache_priorities[(int)$id_product] = Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('
+			SpecificPrice::$_cache_priorities[(int)$id_product] = Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('
 				SELECT `priority`, `id_specific_price_priority`
 				FROM `'._DB_PREFIX_.'specific_price_priority`
 				WHERE `id_product` = '.(int)$id_product.'
@@ -190,7 +190,7 @@ class SpecificPriceCore extends ObjectModel
 			');
 		}
 
-		$priority = self::$_cache_priorities[(int)$id_product];
+		$priority = SpecificPrice::$_cache_priorities[(int)$id_product];
 
 	    if (!$priority)
 	        $priority = Configuration::get('PS_SPECIFIC_PRICE_PRIORITIES');
@@ -209,11 +209,11 @@ class SpecificPriceCore extends ObjectModel
 		*/
 
 		$key = ((int)$id_product.'-'.(int)$id_shop.'-'.(int)$id_currency.'-'.(int)$id_country.'-'.(int)$id_group.'-'.(int)$quantity.'-'.(int)$id_product_attribute.'-'.(int)$id_cart.'-'.(int)$id_customer.'-'.(int)$real_quantity);
-		if (!array_key_exists($key, self::$_specificPriceCache))
+		if (!array_key_exists($key, SpecificPrice::$_specificPriceCache))
 		{
 			$now = date('Y-m-d H:i:s');
-			self::$_specificPriceCache[$key] = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
-				SELECT *, '.SpecificPrice::_getScoreQuery($id_product, $id_shop, $id_currency, $id_country, $id_group, $id_customer).'
+			$query = '
+			SELECT *, '.SpecificPrice::_getScoreQuery($id_product, $id_shop, $id_currency, $id_country, $id_group, $id_customer).'
 				FROM `'._DB_PREFIX_.'specific_price`
 				WHERE `id_product` IN (0, '.(int)$id_product.')
 				AND `id_product_attribute` IN (0, '.(int)$id_product_attribute.')
@@ -228,11 +228,22 @@ class SpecificPriceCore extends ObjectModel
 					AND
 					(`to` = \'0000-00-00 00:00:00\' OR \''.$now.'\' <= `to`)
 				)
-				AND id_cart IN (0, '.(int)$id_cart.')'.
-				(($real_quantity != 0 && !Configuration::get('PS_QTY_DISCOUNT_ON_COMBINATION')) ? ' AND IF(`from_quantity` > 1, `from_quantity`, 0) <= IF(id_product_attribute=0,'.(int)$quantity.' ,'.(int)$real_quantity.')' : 'AND `from_quantity` <= '.max(1, (int)$real_quantity)).'
-				ORDER BY `id_product_attribute` DESC, `from_quantity` DESC, `id_specific_price_rule` ASC, `score` DESC');
+				AND id_cart IN (0, '.(int)$id_cart.') ';
+
+			if ($real_quantity != 0 && !Configuration::get('PS_QTY_DISCOUNT_ON_COMBINATION'))
+				$query .= ' AND IF(`from_quantity` > 1, `from_quantity`, 0) <= IF(id_product_attribute=0,'.(int)$quantity.' ,'.(int)$real_quantity.')';
+			else
+			{
+				$qty_to_use = $id_cart ? (int)$quantity : (int)$real_quantity;
+				$query .= 'AND `from_quantity` <= '.max(1, $qty_to_use);
+			}
+
+			$query .= ' ORDER BY `id_product_attribute` DESC, `from_quantity` DESC, `id_specific_price_rule` ASC, `score` DESC';
+			
+			SpecificPrice::$_specificPriceCache[$key] = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow($query);
+				
 		}
-		return self::$_specificPriceCache[$key];
+		return SpecificPrice::$_specificPriceCache[$key];
 	}
 
 	public static function setPriorities($priorities)