diff --git a/apps/desktop/src/chat/convexMachineClient.ts b/apps/desktop/src/chat/convexMachineClient.ts
index 538398d..55f17d6 100644
--- a/apps/desktop/src/chat/convexMachineClient.ts
+++ b/apps/desktop/src/chat/convexMachineClient.ts
@@ -201,7 +201,10 @@ export async function subscribeMachineMessages(
           const data = (await res.json()) as MessagesPayload
           if (!stopped) {
             callback(data)
-            const newest = data.messages.reduce((max, msg) => Math.max(max, msg.createdAt), lastSince)
+            const newest = (data.messages as ChatMessage[]).reduce(
+              (max: number, msg: ChatMessage) => Math.max(max, msg.createdAt),
+              lastSince
+            )
             lastSince = newest
           }
         } catch (err) {
@@ -224,7 +227,10 @@ export async function subscribeMachineMessages(
     (value) => {
       stopPoll()
       callback(value)
-      const newest = value.messages.reduce((max, msg) => Math.max(max, msg.createdAt), lastSince)
+      const newest = (value.messages as ChatMessage[]).reduce(
+        (max: number, msg: ChatMessage) => Math.max(max, msg.createdAt),
+        lastSince
+      )
       lastSince = newest
     },
     (err) => {