diff --git a/cores/arduino/USBAPI.h b/cores/arduino/USBAPI.h
index 5caacc5..7f468a6 100644
--- a/cores/arduino/USBAPI.h
+++ b/cores/arduino/USBAPI.h
@@ -47,13 +47,13 @@ typedef unsigned long u32;
 //================================================================================
 //	USB
 
-#define EP_TYPE_CONTROL				0x00
-#define EP_TYPE_BULK_IN				0x81
-#define EP_TYPE_BULK_OUT			0x80
-#define EP_TYPE_INTERRUPT_IN		0xC1
-#define EP_TYPE_INTERRUPT_OUT		0xC0
-#define EP_TYPE_ISOCHRONOUS_IN		0x41
-#define EP_TYPE_ISOCHRONOUS_OUT		0x40
+#define EP_TYPE_CONTROL				(0x00)
+#define EP_TYPE_BULK_IN				((1<<EPTYPE1) | (1<<EPDIR))
+#define EP_TYPE_BULK_OUT			(1<<EPTYPE1)
+#define EP_TYPE_INTERRUPT_IN		((1<<EPTYPE1) | (1<<EPTYPE0) | (1<<EPDIR))
+#define EP_TYPE_INTERRUPT_OUT		((1<<EPTYPE1) | (1<<EPTYPE0))
+#define EP_TYPE_ISOCHRONOUS_IN		((1<<EPTYPE0) | (1<<EPDIR))
+#define EP_TYPE_ISOCHRONOUS_OUT		(1<<EPTYPE0)
 
 class USBDevice_
 {