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 f1b29472d06..e40204ea497 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
@@ -382,7 +382,7 @@ ALTER TABLE llx_prelevement_facture_demande RENAME TO llx_prelevement_demande;
 ALTER TABLE llx_prelevement ADD COLUMN fk_salary INTEGER NULL AFTER fk_facture_fourn;
 ALTER TABLE llx_prelevement_demande ADD COLUMN fk_salary INTEGER NULL AFTER fk_facture_fourn;
 
-
 ALTER TABLE llx_user ADD COLUMN birth_place varchar(64);
-ALTER TABLE llx_opensurvey_user_studs ADD COLUMN date_creation datetime NOT NULL;
-ALTER TABLE llx_opensurvey_comments ADD COLUMN date_creation datetime NOT NULL;
\ No newline at end of file
+
+ALTER TABLE llx_opensurvey_user_studs ADD COLUMN date_creation datetime NULL;
+ALTER TABLE llx_opensurvey_comments ADD COLUMN date_creation datetime NULL;