diff --git a/src/knx/ip_parameter_object.cpp b/src/knx/ip_parameter_object.cpp
index 7d67f9f..04da6e4 100644
--- a/src/knx/ip_parameter_object.cpp
+++ b/src/knx/ip_parameter_object.cpp
@@ -7,7 +7,7 @@
 #include "callback_property.h"
 
 //224.0.23.12
-#define DEFAULT_MULTICAST_ADDR 0xE000170C
+#define DEFAULT_MULTICAST_ADDR 0xE000170CUL
 
 IpParameterObject::IpParameterObject(DeviceObject& deviceObject, Platform& platform): _deviceObject(deviceObject),
     _platform(platform)