diff --git a/htdocs/install/mysql/migration/3.3.0-3.4.0.sql b/htdocs/install/mysql/migration/3.3.0-3.4.0.sql
index 46affb6327a..68e84cb609d 100755
--- a/htdocs/install/mysql/migration/3.3.0-3.4.0.sql
+++ b/htdocs/install/mysql/migration/3.3.0-3.4.0.sql
@@ -256,6 +256,7 @@ CREATE TABLE llx_printer_ipp
 ) ENGINE=innodb;
 
 ALTER TABLE llx_socpeople ADD COLUMN ref_ext varchar(128) after entity;
+ALTER TABLE llx_adherent MODIFY COLUMN ref_ext varchar(128);
 
 create table llx_commande_extrafields
 (
diff --git a/htdocs/install/mysql/tables/llx_adherent.sql b/htdocs/install/mysql/tables/llx_adherent.sql
index 936f04d78a4..af15f5da198 100644
--- a/htdocs/install/mysql/tables/llx_adherent.sql
+++ b/htdocs/install/mysql/tables/llx_adherent.sql
@@ -28,7 +28,7 @@ create table llx_adherent
 (
   rowid            integer AUTO_INCREMENT PRIMARY KEY,
   entity           integer DEFAULT 1 NOT NULL,	-- multi company id
-  ref_ext          varchar(30),                 -- reference into an external system (not used by dolibarr)
+  ref_ext          varchar(128),                -- reference into an external system (not used by dolibarr)
 
   civilite         varchar(6),
   lastname         varchar(50),