diff --git a/app/definitions/rest/v1/channels.ts b/app/definitions/rest/v1/channels.ts
index 8b14decb..88ae895c 100644
--- a/app/definitions/rest/v1/channels.ts
+++ b/app/definitions/rest/v1/channels.ts
@@ -52,6 +52,9 @@ export type ChannelsEndpoints = {
 	'channels.convertToTeam': {
 		POST: (params: { channelId: string; channelName: string }) => { team: ITeam };
 	};
+	'channels.join': {
+		POST: (params: { roomId: string; joinCode: string | null }) => { channel: IServerRoomItem };
+	};
 	'channels.close': {
 		POST: (params: { roomId: string }) => {};
 	};
diff --git a/app/lib/rocketchat/services/restApi.ts b/app/lib/rocketchat/services/restApi.ts
index 728d30dd..59264a79 100644
--- a/app/lib/rocketchat/services/restApi.ts
+++ b/app/lib/rocketchat/services/restApi.ts
@@ -221,14 +221,11 @@ export const convertTeamToChannel = ({ teamId, selected }: { teamId: string; sel
 	return sdk.post('teams.convertToChannel', params);
 };
 
-export const joinRoom = (roomId: string, joinCode: string | null, type: 'c' | 'p'): any => {
-	// TODO: join code
+export const joinRoom = (roomId: string, joinCode: string | null, type: 'c' | 'p') => {
 	// RC 0.48.0
 	if (type === 'p') {
-		return sdk.methodCallWrapper('joinRoom', roomId);
+		return sdk.methodCallWrapper('joinRoom', roomId) as Promise<boolean>;
 	}
-	// TODO: missing definitions from server
-	// @ts-ignore
 	return sdk.post('channels.join', { roomId, joinCode });
 };