diff --git a/mysql/migration/1.1.0-1.2.0-RC1.sql b/mysql/migration/1.1.0-1.2.0-RC1.sql
index 684ee8d692e..527eb589b40 100644
--- a/mysql/migration/1.1.0-1.2.0-RC1.sql
+++ b/mysql/migration/1.1.0-1.2.0-RC1.sql
@@ -154,10 +154,11 @@ create table llx_mailing_cibles
   fk_contact         integer NOT NULL,
   nom                varchar(160),
   prenom             varchar(160),
-  email              varchar(160)
+  email              varchar(160) NOT NULL
 
 )type=innodb;
 
+alter table llx_mailing_cibles ADD UNIQUE uk_mailing_cibles (fk_mailing, email);
 
 create table llx_stock_mouvement
 (
diff --git a/mysql/tables/llx_mailing_cibles.sql b/mysql/tables/llx_mailing_cibles.sql
index 8690065fbd2..9f1780809d9 100644
--- a/mysql/tables/llx_mailing_cibles.sql
+++ b/mysql/tables/llx_mailing_cibles.sql
@@ -29,7 +29,7 @@ create table llx_mailing_cibles
   fk_contact         integer NOT NULL,
   nom                varchar(160),
   prenom             varchar(160),
-  email              varchar(160)
+  email              varchar(160) NOT NULL
 
 )type=innodb;