diff --git a/app/definitions/rest/v1/channels.ts b/app/definitions/rest/v1/channels.ts
index 2b5dd5f25..dfc0cd61d 100644
--- a/app/definitions/rest/v1/channels.ts
+++ b/app/definitions/rest/v1/channels.ts
@@ -70,4 +70,10 @@ export type ChannelsEndpoints = {
 	'channels.removeModerator': {
 		POST: (params: { roomId: string; userId: string }) => {};
 	};
+	'channels.addOwner': {
+		POST: (params: { roomId: string; userId: string }) => {};
+	};
+	'channels.removeOwner': {
+		POST: (params: { roomId: string; userId: string }) => {};
+	};
 };
diff --git a/app/lib/rocketchat/services/restApi.ts b/app/lib/rocketchat/services/restApi.ts
index 089ea8dc9..113354de9 100644
--- a/app/lib/rocketchat/services/restApi.ts
+++ b/app/lib/rocketchat/services/restApi.ts
@@ -458,17 +458,14 @@ export const toggleRoomOwner = ({
 	t: SubscriptionType;
 	userId: string;
 	isOwner: boolean;
-}): any => {
+}) => {
+	const type = t as SubscriptionType.CHANNEL;
 	if (isOwner) {
 		// RC 0.49.4
-		// TODO: missing definitions from server
-		// @ts-ignore
-		return sdk.post(`${roomTypeToApiType(t)}.addOwner`, { roomId, userId });
+		return sdk.post(`${roomTypeToApiType(type)}.addOwner`, { roomId, userId });
 	}
 	// RC 0.49.4
-	// TODO: missing definitions from server
-	// @ts-ignore
-	return sdk.post(`${roomTypeToApiType(t)}.removeOwner`, { roomId, userId });
+	return sdk.post(`${roomTypeToApiType(type)}.removeOwner`, { roomId, userId });
 };
 
 export const toggleRoomLeader = ({