diff --git a/PyViCare/PyViCareGateway.py b/PyViCare/PyViCareGateway.py
index fbdf3174..69826b51 100644
--- a/PyViCare/PyViCareGateway.py
+++ b/PyViCare/PyViCareGateway.py
@@ -4,6 +4,10 @@
 
 class Gateway(Device):
 
+    @handleNotSupported
+    def getSerial(self):
+        return self.service.getProperty("gateway.devices")["gatewayId"]
+
     @handleNotSupported
     def getWifiSignalStrength(self):
         return self.service.getProperty("gateway.wifi")["properties"]["strength"]["value"]
diff --git a/tests/test_VitoconnectOpto1.py b/tests/test_VitoconnectOpto1.py
index 671c32aa..1f093d28 100644
--- a/tests/test_VitoconnectOpto1.py
+++ b/tests/test_VitoconnectOpto1.py
@@ -9,6 +9,10 @@ def setUp(self):
         self.service = ViCareServiceMock('response/VitoconnectOpto1.json')
         self.device = Gateway(self.service)
 
+    def test_getSerial(self):
+        self.assertEqual(
+            self.device.getSerial(), "################")
+
     def test_getWifiSignalStrength(self):
         self.assertEqual(
             self.device.getWifiSignalStrength(), -69)