diff --git a/src/hci_transport.h b/src/hci_transport.h
index fb4fd9708..4bc8995b2 100644
--- a/src/hci_transport.h
+++ b/src/hci_transport.h
@@ -63,7 +63,8 @@ typedef struct {
     // unique usb device identifier
 } hci_libusb_config_t;
 
-// inline hci_transport_h4.h
+// inline various hci_transport_X.h files
 extern hci_transport_t * hci_transport_h4_instance();
+extern hci_transport_t * hci_transport_usb_instance();
 
 
diff --git a/src/hci_transport_usb.c b/src/hci_transport_usb.c
index 11f48f7d8..bf8febfa1 100644
--- a/src/hci_transport_usb.c
+++ b/src/hci_transport_usb.c
@@ -56,7 +56,7 @@
 #include <libusb-1.0/libusb.h>
 
 #include "hci.h"
-#include "hci_transport_usb.h"
+#include "hci_transport.h"
 #include "hci_dump.h"
 
 // prototypes