diff --git a/install-dev/sql/db.sql b/install-dev/sql/db.sql
index 0c5a3121b..5f66656aa 100644
--- a/install-dev/sql/db.sql
+++ b/install-dev/sql/db.sql
@@ -1801,7 +1801,8 @@ CREATE TABLE `PREFIX_specific_price_priority` (
 	`id_specific_price_priority` INT NOT NULL AUTO_INCREMENT ,
 	`id_product` INT NOT NULL ,
 	`priority` VARCHAR( 80 ) NOT NULL ,
-	PRIMARY KEY ( `id_specific_price_priority` , `id_product` )
+	PRIMARY KEY ( `id_specific_price_priority` , `id_product` ),
+	UNIQUE KEY `id_product` (`id_product`)
 )  ENGINE=ENGINE_TYPE  DEFAULT CHARSET=utf8;
 
 CREATE TABLE `PREFIX_log` (