diff --git a/htdocs/install/mysql/migration/13.0.0-14.0.0.sql b/htdocs/install/mysql/migration/13.0.0-14.0.0.sql
index ac9da2b1092..e6578a1bc66 100644
--- a/htdocs/install/mysql/migration/13.0.0-14.0.0.sql
+++ b/htdocs/install/mysql/migration/13.0.0-14.0.0.sql
@@ -425,9 +425,9 @@ CREATE TABLE llx_eventorganization_conferenceorboothattendee(
 ALTER TABLE llx_eventorganization_conferenceorboothattendee ADD COLUMN fk_project integer NOT NULL;
 ALTER TABLE llx_eventorganization_conferenceorboothattendee ADD COLUMN fk_invoice integer NULL;
 
-ALTER TABLE llx_eventorganization_conferenceorboothattendee DROP CONSTRAINT fx_eventorganization_conferenceorboothattendee_fk_soc;
-ALTER TABLE llx_eventorganization_conferenceorboothattendee DROP CONSTRAINT fx_eventorganization_conferenceorboothattendee_fk_actioncomm;
-ALTER TABLE llx_eventorganization_conferenceorboothattendee DROP CONSTRAINT fx_eventorganization_conferenceorboothattendee_fk_project;
+ALTER TABLE llx_eventorganization_conferenceorboothattendee DROP FOREIGN KEY fx_eventorganization_conferenceorboothattendee_fk_soc;
+ALTER TABLE llx_eventorganization_conferenceorboothattendee DROP FOREIGN KEY fx_eventorganization_conferenceorboothattendee_fk_actioncomm;
+ALTER TABLE llx_eventorganization_conferenceorboothattendee DROP FOREIGN KEY fx_eventorganization_conferenceorboothattendee_fk_project;
 
 ALTER TABLE llx_eventorganization_conferenceorboothattendee ADD INDEX idx_eventorganization_conferenceorboothattendee_rowid (rowid);
 ALTER TABLE llx_eventorganization_conferenceorboothattendee ADD INDEX idx_eventorganization_conferenceorboothattendee_ref (ref);