diff --git a/cod_session/cod_session.module b/cod_session/cod_session.module
index 92c0c16..4a54556 100644
--- a/cod_session/cod_session.module
+++ b/cod_session/cod_session.module
@@ -452,7 +452,7 @@ function cod_session_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL) {
         ON s.nid = node.nid AND s.vid = node.vid 
         AND s.field_session_slot_nid IN (" . db_placeholders($slots, 'int') . ")
         WHERE node.nid != %d
-        "), array_merge($room_nids, $slots, array($node->nid)));
+        ", 'node'), array_merge($room_nids, $slots, array($node->nid)));
 
         $errors = array();
         while ($record = db_fetch_object($result)) {
@@ -1023,4 +1023,4 @@ function cod_session_time_slot_format($slot) {
 function _cod_session_scheduler_title($type) {
   $type_info = node_get_types('type', $type);
   return t('Schedule a @name', array('@name' => $type_info->name));
-}
\ No newline at end of file
+}