diff --git a/booking.helper.inc b/booking.helper.inc
index a05d77d..f427175 100644
--- a/booking.helper.inc
+++ b/booking.helper.inc
@@ -1593,7 +1593,7 @@ function _booking_leader_helper_email_summary($node) {
 				//find the other person
 				$otherperson_query = db_query("SELECT m.*, p.* FROM {booking_studygroup_mapping} m " .
 					" INNER JOIN {booking_person} p on m.booking_node_id = p.nid " .
-					" WHERE booking_eventid = :eid " .
+					" WHERE p.booking_eventid = :eid " .
 					" AND booking_studygroup_id = :group AND booking_studygroup_role = :role AND booking_session_id = :session",
 					array(':eid' => $event->eid, ':group' => $studygroup->sid, ':role' => $otherrole_id, ':session' => $node->$sessionid,
 				));