diff --git a/networkDevices/NetworkDevice.h b/networkDevices/NetworkDevice.h
index c41d476..b417b5f 100644
--- a/networkDevices/NetworkDevice.h
+++ b/networkDevices/NetworkDevice.h
@@ -32,7 +32,7 @@ public:
     virtual bool isConnected() = 0;
     virtual int8_t signalStrength() = 0;
     
-    virtual String localIP() = '';
+    virtual String localIP() = 0;
 
     virtual void mqttSetClientId(const char* clientId) = 0;
     virtual void mqttSetCleanSession(bool cleanSession) = 0;