diff --git a/dev/initdemo/mysqldump_dolibarr_14.0.0.sql b/dev/initdemo/mysqldump_dolibarr_14.0.0.sql
index a77eb9dd673..22f78a32509 100644
--- a/dev/initdemo/mysqldump_dolibarr_14.0.0.sql
+++ b/dev/initdemo/mysqldump_dolibarr_14.0.0.sql
@@ -11767,7 +11767,7 @@ CREATE TABLE `llx_recruitment_recruitmentcandidature` (
   `remuneration_requested` int(11) DEFAULT NULL,
   `remuneration_proposed` int(11) DEFAULT NULL,
   `fk_recruitment_origin` int(11) DEFAULT NULL,
-  `email_msgid` varchar(255) CHARACTER SET utf8mb4 DEFAULT NULL,
+  `email_msgid` varchar(175) CHARACTER SET utf8mb4 DEFAULT NULL,
   `entity` int(11) NOT NULL DEFAULT 1,
   `date_birth` date DEFAULT NULL,
   PRIMARY KEY (`rowid`),
diff --git a/htdocs/install/mysql/tables/llx_projet.sql b/htdocs/install/mysql/tables/llx_projet.sql
index cd5eedd2c9a..97acc8d3411 100644
--- a/htdocs/install/mysql/tables/llx_projet.sql
+++ b/htdocs/install/mysql/tables/llx_projet.sql
@@ -40,7 +40,7 @@ create table llx_projet
   fk_user_close    integer DEFAULT NULL,
   note_private     text,
   note_public      text,
-  email_msgid      varchar(255),				-- if project or lead is created by email collector, we store here MSG ID
+  email_msgid      varchar(175),				-- if project or lead is created by email collector, we store here MSG ID. Do not use a too large value, it generates trouble with unique index
   --budget_days      real,                      -- budget in days is sum of field planned_workload of tasks
   opp_amount       double(24,8),
   budget_amount    double(24,8),