diff --git a/firmware/usbcdc/util.c b/firmware/usbcdc/util.c
index d1d8753..66024f6 100644
--- a/firmware/usbcdc/util.c
+++ b/firmware/usbcdc/util.c
@@ -57,6 +57,6 @@ void usbCDCInit(){
 #endif
 }
 
-usbCDCOff(void){
+void usbCDCOff(void){
     USB_Connect(FALSE);
 }