diff --git a/install-dev/data/db_structure.sql b/install-dev/data/db_structure.sql
index d742e995a..1df5385e6 100644
--- a/install-dev/data/db_structure.sql
+++ b/install-dev/data/db_structure.sql
@@ -585,6 +585,7 @@ CREATE TABLE `PREFIX_customer_message` (
   `user_agent` varchar(128) default NULL,
   `date_add` datetime NOT NULL,
   `private` TINYINT NOT NULL DEFAULT  '0',
+  `read` tinyint(1) NOT NULL default '0',
   PRIMARY KEY  (`id_customer_message`),
   KEY `id_customer_thread` (`id_customer_thread`),
   KEY `id_employee` (`id_employee`)
diff --git a/install-dev/upgrade/sql/1.5.0.17.sql b/install-dev/upgrade/sql/1.5.0.17.sql
index cfee2b4ae..225002820 100644
--- a/install-dev/upgrade/sql/1.5.0.17.sql
+++ b/install-dev/upgrade/sql/1.5.0.17.sql
@@ -2,3 +2,5 @@ SET NAMES 'utf8';
 
 ALTER TABLE `PREFIX_order_detail_tax` CHANGE `unit_amount` `unit_amount` DECIMAL(16, 6) NOT NULL DEFAULT '0.000000';
 ALTER TABLE `PREFIX_order_detail_tax` CHANGE `total_amount` `unit_amount` DECIMAL(16, 6) NOT NULL DEFAULT '0.000000';
+
+ALTER TABLE `PREFIX_customer_message` ADD `read` tinyint(1) NOT NULL default '0' AFTER `private`;
\ No newline at end of file