diff --git a/htdocs/install/mysql/migration/3.6.0-3.7.0.sql b/htdocs/install/mysql/migration/3.6.0-3.7.0.sql
index e8c77100bf9..0e77022abef 100755
--- a/htdocs/install/mysql/migration/3.6.0-3.7.0.sql
+++ b/htdocs/install/mysql/migration/3.6.0-3.7.0.sql
@@ -1121,3 +1121,12 @@ ALTER TABLE llx_extrafields ADD alwayseditable INTEGER DEFAULT 0 AFTER pos;
 -- add supplier webservice fields
 ALTER TABLE llx_societe ADD webservices_url varchar(255) DEFAULT NULL;
 ALTER TABLE llx_societe ADD webservices_key varchar(128) DEFAULT NULL;
+
+-- changes size of ref in commande_fourn and facture_fourn
+ALTER TABLE llx_commande_fournisseur MODIFY COLUMN ref VARCHAR(255);
+ALTER TABLE llx_commande_fournisseur MODIFY COLUMN ref_ext VARCHAR(255);
+ALTER TABLE llx_commande_fournisseur MODIFY COLUMN ref_supplier VARCHAR(255);
+
+ALTER TABLE llx_facture_fourn MODIFY COLUMN ref VARCHAR(255);
+ALTER TABLE llx_facture_fourn MODIFY COLUMN ref_ext VARCHAR(255);
+ALTER TABLE llx_facture_fourn MODIFY COLUMN ref_supplier VARCHAR(255);
diff --git a/htdocs/install/mysql/tables/llx_commande_fournisseur.sql b/htdocs/install/mysql/tables/llx_commande_fournisseur.sql
index 2ecf9e10442..ff87110c72a 100644
--- a/htdocs/install/mysql/tables/llx_commande_fournisseur.sql
+++ b/htdocs/install/mysql/tables/llx_commande_fournisseur.sql
@@ -23,11 +23,11 @@ create table llx_commande_fournisseur
 (
   rowid					integer AUTO_INCREMENT PRIMARY KEY,
 
-  ref					varchar(30) NOT NULL,          -- order number
+  ref					varchar(255) NOT NULL,          -- order number
   entity				integer DEFAULT 1 NOT NULL,	 -- multi company id
 
-  ref_ext				varchar(30),                  -- reference into an external system (not used by dolibarr)
-  ref_supplier			varchar(30),
+  ref_ext				varchar(64),                  -- reference into an external system (not used by dolibarr)
+  ref_supplier			varchar(255),
 
   fk_soc				integer NOT NULL,
   fk_projet				integer DEFAULT 0,             -- project id
diff --git a/htdocs/install/mysql/tables/llx_facture_fourn.sql b/htdocs/install/mysql/tables/llx_facture_fourn.sql
index 3a71c2455aa..33773b7a9cb 100644
--- a/htdocs/install/mysql/tables/llx_facture_fourn.sql
+++ b/htdocs/install/mysql/tables/llx_facture_fourn.sql
@@ -22,11 +22,11 @@
 create table llx_facture_fourn
 (
   rowid					integer AUTO_INCREMENT PRIMARY KEY,
-  ref					varchar(30),
-  ref_supplier			varchar(50) NOT NULL,
+  ref					varchar(255),
+  ref_supplier			varchar(255) NOT NULL,
   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(255),                  -- reference into an external system (not used by dolibarr)
 
   type					smallint DEFAULT 0 NOT NULL,
   fk_soc				integer NOT NULL,