diff --git a/main/install/dokeos_main.sql b/main/install/dokeos_main.sql
index 0911b90f92..4b7be2b9f4 100644
--- a/main/install/dokeos_main.sql
+++ b/main/install/dokeos_main.sql
@@ -466,7 +466,6 @@ DROP TABLE IF EXISTS session_rel_course;
 CREATE TABLE session_rel_course (
   id_session smallint unsigned NOT NULL default '0',
   course_code char(40) NOT NULL default '',
-  id_coach int unsigned NOT NULL default '0',
   nbr_users smallint unsigned NOT NULL default '0',
   PRIMARY KEY  (id_session,course_code),
   KEY course_code (course_code)