diff --git a/src/helpers/channels/threads/get_archived_threads.ts b/src/helpers/channels/threads/get_archived_threads.ts
index 50229b260..4a4de2927 100644
--- a/src/helpers/channels/threads/get_archived_threads.ts
+++ b/src/helpers/channels/threads/get_archived_threads.ts
@@ -4,7 +4,7 @@ import { endpoints } from "../../../util/constants.ts";
 import { camelKeysToSnakeCase } from "../../../util/utils.ts";
 
 export async function getArchivedThreads(
-  channelId: string,
+  channelId: bigint,
   options?: ListPublicArchivedThreads & {
     type?: "public" | "private" | "privateJoinedThreads";
   },
diff --git a/src/helpers/channels/threads/get_thread_members.ts b/src/helpers/channels/threads/get_thread_members.ts
index b56b0f576..34c1d0e13 100644
--- a/src/helpers/channels/threads/get_thread_members.ts
+++ b/src/helpers/channels/threads/get_thread_members.ts
@@ -6,7 +6,7 @@ import { endpoints } from "../../../util/constants.ts";
 
 // TODO(threads): it seems like the documented return type is wrong
 /** Returns array of thread members objects that are members of the thread. */
-export async function getThreadMembers(channelId: string) {
+export async function getThreadMembers(channelId: bigint) {
   // TODO(threads): perm check
   // TODO(threads): intents check
   const channel = await cacheHandlers.get("channels", channelId);
diff --git a/src/helpers/channels/threads/remove_from_thread.ts b/src/helpers/channels/threads/remove_from_thread.ts
index 7cf250275..9e967a843 100644
--- a/src/helpers/channels/threads/remove_from_thread.ts
+++ b/src/helpers/channels/threads/remove_from_thread.ts
@@ -5,7 +5,7 @@ import { Errors } from "../../../types/misc/errors.ts";
 import { endpoints } from "../../../util/constants.ts";
 
 /** Removes another user from a thread. Requires the MANAGE_THREADS permission or that you are the creator of the thread. Also requires the thread is not archived. Returns a 204 empty response on success. Fires a Thread Members Update Gateway event. */
-export async function removeFromThread(channelId: string, userId?: string) {
+export async function removeFromThread(channelId: bigint, userId?: bigint) {
   // TODO(threads): perm check
   const channel = await cacheHandlers.get("channels", channelId);
   if (channel) {
diff --git a/src/helpers/channels/threads/start_thread.ts b/src/helpers/channels/threads/start_thread.ts
index 5fe429c22..dc4f8bbde 100644
--- a/src/helpers/channels/threads/start_thread.ts
+++ b/src/helpers/channels/threads/start_thread.ts
@@ -11,8 +11,8 @@ import { camelKeysToSnakeCase } from "../../../util/utils.ts";
  * @param messageId when provided the thread will be public
  */
 export async function startThread(
-  channelId: string,
-  options: StartThread & { messageId?: string },
+  channelId: bigint,
+  options: StartThread & { messageId?: bigint },
 ) {
   const channel = await cacheHandlers.get("channels", channelId);
   if (channel) {