diff --git a/hardware/arduino/sam/cores/arduino/USB/PluggableUSB.h b/hardware/arduino/sam/cores/arduino/USB/PluggableUSB.h
index 4e08e5dfc..a7ee6207b 100644
--- a/hardware/arduino/sam/cores/arduino/USB/PluggableUSB.h
+++ b/hardware/arduino/sam/cores/arduino/USB/PluggableUSB.h
@@ -21,7 +21,6 @@
 #define PUSB_h
 
 #include "USBAPI.h"
-#include <cstddef>
 
 #if defined(USBCON)
 
diff --git a/hardware/arduino/sam/cores/arduino/USB/USBAPI.h b/hardware/arduino/sam/cores/arduino/USB/USBAPI.h
index ee9739cb5..dbc2ec5dc 100644
--- a/hardware/arduino/sam/cores/arduino/USB/USBAPI.h
+++ b/hardware/arduino/sam/cores/arduino/USB/USBAPI.h
@@ -23,9 +23,6 @@
 
 #include "RingBuffer.h"
 #include "Stream.h"
-#include <cstddef>
-
-#define min(a, b)   Min(a, b)
 
 //================================================================================
 //================================================================================