diff --git a/booking.studygroups.inc b/booking.studygroups.inc
index 9597f40..536b53d 100644
--- a/booking.studygroups.inc
+++ b/booking.studygroups.inc
@@ -726,7 +726,7 @@ function booking_studygroups_update_form($node, &$form_state, $sid) {
 			);
 		}
 	
-		_booking_studygroups_update_preallocate($group, $group_mapping, $working_list, $session_count, $calculation_messages);
+		_booking_studygroups_update_preallocate($group, $group_mapping, $session_count, $working_list, $calculation_messages);
 		/*
 		//@todo move this foreach loop into a separate function
 		//search for the leaders helpers, spouses and boyfriend/girlfriend for this study group to pre-allocate