diff --git a/ui-ngx/src/app/modules/home/components/widget/lib/gateway/connectors-configuration/modbus/modbus-basic-config/modbus-basic-config.component.ts b/ui-ngx/src/app/modules/home/components/widget/lib/gateway/connectors-configuration/modbus/modbus-basic-config/modbus-basic-config.component.ts
index 87aef8d43e..e85d9d31c0 100644
--- a/ui-ngx/src/app/modules/home/components/widget/lib/gateway/connectors-configuration/modbus/modbus-basic-config/modbus-basic-config.component.ts
+++ b/ui-ngx/src/app/modules/home/components/widget/lib/gateway/connectors-configuration/modbus/modbus-basic-config/modbus-basic-config.component.ts
@@ -124,7 +124,7 @@ export class ModbusBasicConfigComponent implements ControlValueAccessor, Validat
   validate(basicConfigControl: UntypedFormControl): ValidationErrors | null {
     const masterHasSlaves = !!basicConfigControl.value.master?.slaves?.length;
     const slaveEnabled = this.enableSlaveControl.value;
-    const slaveIsValid = this.basicFormGroup.get('slave').valid;
+    const slaveIsValid = this.basicFormGroup.valid;
 
     if ((slaveEnabled && slaveIsValid) || (masterHasSlaves && !slaveEnabled)) {
       return null;