diff --git a/htdocs/install/mysql/migration/10.0.0-11.0.0.sql b/htdocs/install/mysql/migration/10.0.0-11.0.0.sql
index bd556d089cd..63a71d59f44 100644
--- a/htdocs/install/mysql/migration/10.0.0-11.0.0.sql
+++ b/htdocs/install/mysql/migration/10.0.0-11.0.0.sql
@@ -71,4 +71,6 @@ create table llx_payment_salary_extrafields
 
 ALTER TABLE llx_payment_salary_extrafields ADD INDEX idx_payment_salary_extrafields (fk_object);
 
+ALTER TABLE llx_c_price_expression MODIFY COLUMN expression varchar(255) NOT NULL;
+
 UPDATE llx_bank_url set url = REPLACE( url, 'compta/salaries/', 'salaries/');