diff --git a/src/futures-client.ts b/src/futures-client.ts
index 2426e93..6041ddf 100644
--- a/src/futures-client.ts
+++ b/src/futures-client.ts
@@ -108,7 +108,7 @@ export class FuturesClient extends BaseRestClient {
     endTime: string, 
     limit?: string,
     kLineType?: 'market' | 'mark' | 'index'
-  ): Promise<FuturesCandleData[]> {
+  ): Promise<APIResponse<FuturesCandleData[]>> {
     return this.get('/api/mix/v1/market/candles', {
       symbol,
       granularity,