diff --git a/code/espurna/config/arduino.h b/code/espurna/config/arduino.h
index 150dae78..9ab0e280 100644
--- a/code/espurna/config/arduino.h
+++ b/code/espurna/config/arduino.h
@@ -7,7 +7,9 @@
 // General
 //--------------------------------------------------------------------------------
 
-//#define DEBUG_PORT              Serial
+#ifndef DEBUG_PORT
+#define DEBUG_PORT              Serial
+#endif
 
 //--------------------------------------------------------------------------------
 // Hardware