diff --git a/hardware/arduino/sam/variants/adk2/variant.h b/hardware/arduino/sam/variants/adk2/variant.h
index 266a84070..4b1816abb 100644
--- a/hardware/arduino/sam/variants/adk2/variant.h
+++ b/hardware/arduino/sam/variants/adk2/variant.h
@@ -24,7 +24,7 @@
  *----------------------------------------------------------------------------*/
 
 // We have native USB on this variant
-#define USBCON
+//#define USBCON
 
 #include "Arduino.h"
 #ifdef __cplusplus