diff --git a/source/usb.c b/source/usb.c
index 51609dc..529c0c1 100644
--- a/source/usb.c
+++ b/source/usb.c
@@ -39,6 +39,7 @@
 
 #define USB_SS_BCD_REVISION         0x0300
 #define USB_SS_EP_MAX_PACKET_SIZE   0x400
+
 /* Type definitions. */
 
 typedef struct {