diff --git a/booking.variety_admin.inc b/booking.variety_admin.inc
index e126587..1308056 100644
--- a/booking.variety_admin.inc
+++ b/booking.variety_admin.inc
@@ -767,8 +767,13 @@ function booking_variety_regn_edit_form_submit($form, &$form_state) {
         watchdog('booking_debug', 'Person @nid in timeslot @tid is no longer registered for a variety session', array(
           '@nid' => $values['nid'], '@tid' => $previous_tid
         ));
+        // reduce regn count for old session
+        db_update('booking_variety_sessions')
+          ->expression('booking_variety_regncount', 'booking_variety_regncount - :count', array(':count' => 1))
+          ->condition('vid', $previous_sid)
+          ->execute();          
       }
-      if ($booking_variety_ids[$previous_tid] != $previous_sid) {
+      elseif ($booking_variety_ids[$previous_tid] != $previous_sid) {
         // reduce regn count for old session
         db_update('booking_variety_sessions')
           ->expression('booking_variety_regncount', 'booking_variety_regncount - :count', array(':count' => 1))