diff --git a/api/src/routes/channels/#channel_id/messages/#message_id/ack.ts b/api/src/routes/channels/#channel_id/messages/#message_id/ack.ts
index 786e4581..208c1da4 100644
--- a/api/src/routes/channels/#channel_id/messages/#message_id/ack.ts
+++ b/api/src/routes/channels/#channel_id/messages/#message_id/ack.ts
@@ -1,4 +1,4 @@
-import { emitEvent, getPermission, MessageAckEvent, ReadState } from "@fosscord/util";
+import { emitEvent, getPermission, MessageAckEvent, ReadState, Snowflake } from "@fosscord/util";
import { Request, Response, Router } from "express";
import { route } from "@fosscord/api";
@@ -18,7 +18,11 @@ router.post("/", route({ body: "MessageAcknowledgeSchema" }), async (req: Reques
const permission = await getPermission(req.user_id, undefined, channel_id);
permission.hasThrow("VIEW_CHANNEL");
- await ReadState.update({ user_id: req.user_id, channel_id }, { user_id: req.user_id, channel_id, last_message_id: message_id });
+ let read_state = await ReadState.findOne({ user_id: req.user_id, channel_id });
+ if (!read_state) read_state = new ReadState({ user_id: req.user_id, channel_id });
+ read_state.last_message_id = message_id;
+
+ await read_state.save();
await emitEvent({
event: "MESSAGE_ACK",
|