diff --git a/main.js b/main.js
index 8e94081..31fe61f 100644
--- a/main.js
+++ b/main.js
@@ -502,6 +502,11 @@ client.on("Room.timeline", function (event, room) {
             return;
         }
 
+        if (event.getTs() < (Date.now() - 1000 * 60 * 60 * 8)) {
+            // Ignore old events (8 hrs), they're probably duplicates or something.
+            return;
+        }
+
         if (event.getContent().body.toLowerCase().startsWith("!sms")) {
             // capture command to start room for new number
             const matches = event.getContent().body.match(/([1-9]?[0-9]{10})/g);