diff --git a/src/knx/device_object.h b/src/knx/device_object.h
index fb3fd74..9a3ad4d 100644
--- a/src/knx/device_object.h
+++ b/src/knx/device_object.h
@@ -9,7 +9,7 @@ class DeviceObject: public InterfaceObject
 public:
     // increase this version anytime DeviceObject-API changes 
     // the following value represents the serialized representation of DeviceObject.
-    const uint16_t apiVersion = 2;
+    const uint16_t apiVersion = 1;
     
     DeviceObject();
     uint8_t* save(uint8_t* buffer) override;