diff --git a/web/src/app/Api.js b/web/src/app/Api.js
index 520f110e..ff0af948 100644
--- a/web/src/app/Api.js
+++ b/web/src/app/Api.js
@@ -11,7 +11,7 @@ import {
 class Api {
     async poll(baseUrl, topic, since, user) {
         const shortUrl = topicShortUrl(baseUrl, topic);
-        const url = (since > 1) // FIXME Ahh, this is >1, because we do +1 when we call this .....
+        const url = (since)
             ? topicUrlJsonPollWithSince(baseUrl, topic, since)
             : topicUrlJsonPoll(baseUrl, topic);
         const messages = [];
diff --git a/web/src/app/Connection.js b/web/src/app/Connection.js
index 9aedf211..a4d612e6 100644
--- a/web/src/app/Connection.js
+++ b/web/src/app/Connection.js
@@ -44,7 +44,7 @@ class Connection {
                     console.log(`[Connection, ${this.shortUrl}] Unexpected message. Ignoring.`);
                     return;
                 }
-                this.since = data.time + 1; // Sigh. This works because on reconnect, we wait 5+ seconds anyway.
+                this.since = data.id;
                 this.onNotification(this.subscriptionId, data);
             } catch (e) {
                 console.log(`[Connection, ${this.shortUrl}] Error handling message: ${e}`);
@@ -82,8 +82,8 @@ class Connection {
 
     wsUrl() {
         const params = [];
-        if (this.since > 0) {
-            params.push(`since=${this.since.toString()}`);
+        if (this.since) {
+            params.push(`since=${this.since}`);
         }
         if (this.user !== null) {
             const auth = encodeBase64Url(basicAuth(this.user.username, this.user.password));
diff --git a/web/src/app/ConnectionManager.js b/web/src/app/ConnectionManager.js
index 67b41362..160d36d1 100644
--- a/web/src/app/ConnectionManager.js
+++ b/web/src/app/ConnectionManager.js
@@ -17,7 +17,7 @@ class ConnectionManager {
                 const baseUrl = subscription.baseUrl;
                 const topic = subscription.topic;
                 const user = users.get(baseUrl);
-                const since = 0;
+                const since = subscription.last;
                 const connection = new Connection(id, baseUrl, topic, user, since, onNotification);
                 this.connections.set(id, connection);
                 console.log(`[ConnectionManager] Starting new connection ${id}`);
diff --git a/web/src/app/Subscription.js b/web/src/app/Subscription.js
index ce436a0f..ece61df1 100644
--- a/web/src/app/Subscription.js
+++ b/web/src/app/Subscription.js
@@ -6,15 +6,15 @@ class Subscription {
         this.baseUrl = baseUrl;
         this.topic = topic;
         this.notifications = new Map(); // notification ID -> notification object
-        this.last = 0;
+        this.last = null; // Last message ID
     }
 
     addNotification(notification) {
-        if (this.notifications.has(notification.id) || notification.time < this.last) {
+        if (this.notifications.has(notification.id)) {
             return false;
         }
         this.notifications.set(notification.id, notification);
-        this.last = notification.time;
+        this.last = notification.id;
         return true;
     }
 
diff --git a/web/src/components/App.js b/web/src/components/App.js
index ca4864e1..ee42513c 100644
--- a/web/src/components/App.js
+++ b/web/src/components/App.js
@@ -22,7 +22,6 @@ import notificationManager from "../app/NotificationManager";
 // TODO user management
 // TODO embed into ntfy server
 // TODO remember selected subscription
-// TODO since=<ID>
 
 const App = () => {
     console.log(`[App] Rendering main view`);
@@ -70,7 +69,7 @@ const App = () => {
         })
     };
     const poll = (subscription, user) => {
-        const since = subscription.last + 1; // FIXME, sigh ...
+        const since = subscription.last;
         api.poll(subscription.baseUrl, subscription.topic, since, user)
             .then(notifications => {
                 setSubscriptions(prev => {