diff --git a/SourceCode/arduino/src/main.cpp b/SourceCode/arduino/src/main.cpp
index f28d940..def7ff8 100644
--- a/SourceCode/arduino/src/main.cpp
+++ b/SourceCode/arduino/src/main.cpp
@@ -18,7 +18,7 @@ void setup_wifi()
     delay(2000);
     log_d("Connecting... (%i/%i)", retries++, max_retries);
   }
-  log_i("Connected, IP Address: %s", WiFi.localIP().toString());
+  log_i("Connected, IP Address: %s", WiFi.localIP().toString().c_str());
 }
 
 void setup()