diff --git a/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-service-rpc.component.ts b/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-service-rpc.component.ts
index 317c547725..a8ad61e1ec 100644
--- a/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-service-rpc.component.ts
+++ b/ui-ngx/src/app/modules/home/components/widget/lib/gateway/gateway-service-rpc.component.ts
@@ -61,7 +61,7 @@ export class GatewayServiceRPCComponent implements AfterViewInit {
     this.commandForm = this.fb.group({
       command: [null,[Validators.required]],
       time: [60, [Validators.required, Validators.min(1)]],
-      params: [{}, [jsonRequired]],
+      params: ['{}', [jsonRequired]],
       result: [null]
     });
   }