diff --git a/lib/devices/vacuum.js b/lib/devices/vacuum.js
index d116bee..350ac8f 100644
--- a/lib/devices/vacuum.js
+++ b/lib/devices/vacuum.js
@@ -9,7 +9,10 @@ const MiioApi = require('../device');
 const BatteryLevel = require('./capabilities/battery-level');
 
 function checkResult(r) {
-	if(r !== 0) {
+	//console.log(r)
+	// {"result":0,"id":17} 	  = Firmware 3.3.9_003095 (Gen1)
+	// {"result":["ok"],"id":11}  = Firmware 3.3.9_003194 (Gen1), 3.3.9_001168 (Gen2)
+	if( r !== 0 && r[0] !== 'ok' ) {
 		throw new Error('Could not complete call to device');
 	}
 }