diff --git a/main.js b/main.js
index c3015ba..dc5c231 100644
--- a/main.js
+++ b/main.js
@@ -109,13 +109,13 @@ function createOrJoinSMSRoom(tel, ournumber, callback) {
         if (inRoom) {
             // we're already in the room, do nothing
             logger.debug("Room " + roomName + " already joined.");
-            client.setRoomTag(roomid, "com.netsyms.matrix-bridge-voxtelesys.sms", {tel: tel, ournumber: ournumber});
+            client.setRoomTag(res.room_id, "com.netsyms.matrix-bridge-voxtelesys.sms", {tel: tel, ournumber: ournumber});
             callback(res.room_id);
         } else {
             // not in the room, join it
             client.joinRoom(res.room_id).then((room) => {
                 logger.debug("Room " + roomName + " joined.");
-                client.setRoomTag(roomid, "com.netsyms.matrix-bridge-voxtelesys.sms", {tel: tel, ournumber: ournumber});
+                client.setRoomTag(room.room_id, "com.netsyms.matrix-bridge-voxtelesys.sms", {tel: tel, ournumber: ournumber});
                 callback(room.room_id);
             });
         }