diff --git a/htdocs/install/mysql/migration/16.0.0-17.0.0.sql b/htdocs/install/mysql/migration/16.0.0-17.0.0.sql
index 874dcb66f1b..9f76a4229bc 100644
--- a/htdocs/install/mysql/migration/16.0.0-17.0.0.sql
+++ b/htdocs/install/mysql/migration/16.0.0-17.0.0.sql
@@ -183,3 +183,4 @@ ALTER TABLE llx_socpeople ADD INDEX idx_socpeople_lastname (lastname);
 
 ALTER TABLE llx_societe ADD INDEX idx_societe_nom(nom);
 
+ALTER TABLE llx_extrafields MODIFY COLUMN fielddefault text;
diff --git a/htdocs/install/mysql/tables/llx_extrafields.sql b/htdocs/install/mysql/tables/llx_extrafields.sql
index 33a317d4abd..37deb0a227a 100644
--- a/htdocs/install/mysql/tables/llx_extrafields.sql
+++ b/htdocs/install/mysql/tables/llx_extrafields.sql
@@ -27,7 +27,7 @@ create table llx_extrafields
 	type            varchar(8),
 	size            varchar(8) DEFAULT NULL,
 	fieldcomputed   text,
-	fielddefault    varchar(255),
+	fielddefault    text,
 	fieldunique     integer DEFAULT 0,
 	fieldrequired   integer DEFAULT 0,
 	perms			varchar(255),								-- not used yet