diff --git a/htdocs/install/mysql/migration/13.0.0-14.0.0.sql b/htdocs/install/mysql/migration/13.0.0-14.0.0.sql
index 811c07c98ed..9e65e1d82ff 100644
--- a/htdocs/install/mysql/migration/13.0.0-14.0.0.sql
+++ b/htdocs/install/mysql/migration/13.0.0-14.0.0.sql
@@ -48,6 +48,10 @@ UPDATE llx_c_country SET eec = 1 WHERE code IN ('AT','BE','BG','CY','CZ','DE','D
 
 -- For v14
 
+ALTER TABLE llx_mailing_cibles MODIFY COLUMN tag varchar(64) NULL;
+ALTER TABLE llx_mailing_cibles ADD INDEX idx_mailing_cibles_tag (tag);
+
+
 ALTER TABLE llx_c_availability ADD COLUMN position integer NOT NULL DEFAULT 0;
 
 ALTER TABLE llx_adherent ADD COLUMN ref varchar(30) AFTER rowid;
diff --git a/htdocs/install/mysql/tables/llx_mailing_cibles.key.sql b/htdocs/install/mysql/tables/llx_mailing_cibles.key.sql
index 709b12de31b..12ae5b5cc17 100644
--- a/htdocs/install/mysql/tables/llx_mailing_cibles.key.sql
+++ b/htdocs/install/mysql/tables/llx_mailing_cibles.key.sql
@@ -21,3 +21,5 @@ ALTER TABLE llx_mailing_cibles ADD UNIQUE uk_mailing_cibles (fk_mailing, email);
 
 ALTER TABLE llx_mailing_cibles ADD INDEX idx_mailing_cibles_email (email);
 
+ALTER TABLE llx_mailing_cibles ADD INDEX idx_mailing_cibles_tag (tag);
+
diff --git a/htdocs/install/mysql/tables/llx_mailing_cibles.sql b/htdocs/install/mysql/tables/llx_mailing_cibles.sql
index 096142b10ad..da0b6c1683a 100644
--- a/htdocs/install/mysql/tables/llx_mailing_cibles.sql
+++ b/htdocs/install/mysql/tables/llx_mailing_cibles.sql
@@ -28,7 +28,7 @@ create table llx_mailing_cibles
   firstname			varchar(160),
   email				varchar(160) NOT NULL,
   other				varchar(255) NULL,
-  tag				varchar(128) NULL,
+  tag				varchar(64) NULL,					-- a unique key as a hash of: dolibarr_main_instance_unique_id;email;lastname;mailing_id;MAILING_EMAIL_UNSUBSCRIBE_KEY
   statut			smallint NOT NULL DEFAULT 0,		-- -1 = error, 0 = not sent, ...
   source_url		varchar(255),
   source_id			integer,