diff --git a/Arduino/ArduinoParticipant.cpp b/Arduino/ArduinoParticipant.cpp
index f74a746..b283052 100644
--- a/Arduino/ArduinoParticipant.cpp
+++ b/Arduino/ArduinoParticipant.cpp
@@ -19,7 +19,9 @@
 namespace RoboidControl {
 namespace Arduino {
 
+#if defined(ARDUINO) && defined(HAS_WIFI)
 WiFiUDP* udp;
+#endif
 
 void ParticipantUDP::Setup() {
 #if defined(ARDUINO) && defined(HAS_WIFI)
diff --git a/Participants/ParticipantUDP.cpp b/Participants/ParticipantUDP.cpp
index 247b7c9..f946a00 100644
--- a/Participants/ParticipantUDP.cpp
+++ b/Participants/ParticipantUDP.cpp
@@ -25,9 +25,7 @@
 
 namespace RoboidControl {
 
-ParticipantUDP::ParticipantUDP(int port) {
-  this->ipAddress = "0.0.0.0";
-  this->port = port;
+ParticipantUDP::ParticipantUDP(int port) : Participant("0.0.0.0", port) {
   this->remoteSite = nullptr;
   if (this->port == 0)
     this->isIsolated = true;