diff --git a/src/coinm-client.ts b/src/coinm-client.ts
index 18782b48..bbd580e8 100644
--- a/src/coinm-client.ts
+++ b/src/coinm-client.ts
@@ -258,7 +258,7 @@ export class CoinMClient extends BaseRestClient {
 
   submitNewOrder(
     params: NewFuturesOrderParams,
-  ): Promise<NewOrderResult | NewOrderError> {
+  ): Promise<NewOrderResult> {
     this.validateOrderId(params, 'newClientOrderId');
     return this.postPrivate('dapi/v1/order', params);
   }
diff --git a/src/usdm-client.ts b/src/usdm-client.ts
index b84b6d0b..aa642de7 100644
--- a/src/usdm-client.ts
+++ b/src/usdm-client.ts
@@ -272,7 +272,7 @@ export class USDMClient extends BaseRestClient {
 
   submitNewOrder(
     params: NewFuturesOrderParams,
-  ): Promise<NewOrderResult | NewOrderError> {
+  ): Promise<NewOrderResult> {
     this.validateOrderId(params, 'newClientOrderId');
     return this.postPrivate('fapi/v1/order', params);
   }