diff --git a/src/components/Sidebar.tsx b/src/components/Sidebar.tsx
index a88c951..04733b5 100644
--- a/src/components/Sidebar.tsx
+++ b/src/components/Sidebar.tsx
@@ -94,7 +94,9 @@ export default function AppSidebar({
           );
 
         if (onNewMessage) onNewMessage(m);
-      }
+      },
+      undefined,
+      messages ? messages[messages.length - 1].id : undefined
     );
     setUserList((prev) => {
       prev[user.id] = user;
diff --git a/src/lib/auth.ts b/src/lib/auth.ts
index 9022e5c..8df5ffd 100644
--- a/src/lib/auth.ts
+++ b/src/lib/auth.ts
@@ -9,7 +9,8 @@ export default async function auth(
   setServer: Dispatch<SetStateAction<Server | undefined>>,
   setMessages: (m: Message[]) => void,
   addMessage: (m: Message) => void,
-  onNewMessage?: (m: Message) => void
+  onNewMessage?: (m: Message) => void,
+  lastMessage?: number
 ) {
   console.log("Authenticating with server id:", id);
 
@@ -30,7 +31,7 @@ export default async function auth(
       JSON.stringify({
         version: "0.0.1",
         auth_token: server_auth,
-        last_message: 0,
+        last_message: lastMessage || 0,
       })
     );
   };