diff --git a/MQTTSNGateway/src/linux/udp6/SensorNetwork.cpp b/MQTTSNGateway/src/linux/udp6/SensorNetwork.cpp
index 353d793..73ddb2d 100644
--- a/MQTTSNGateway/src/linux/udp6/SensorNetwork.cpp
+++ b/MQTTSNGateway/src/linux/udp6/SensorNetwork.cpp
@@ -424,7 +424,7 @@ int UDPPort6::broadcast(const uint8_t* buf, uint32_t length)
 
 #ifdef  DEBUG_NW
     char addrBuf[INET6_ADDRSTRLEN];
-    addr->sprint(addrBuf);
+    _grpAddr.sprint(addrBuf);
     D_NWSTACK("sendto %s\n", addrBuf);
 #endif