diff --git a/devicemodel/include/usb_core.h b/devicemodel/include/usb_core.h
index 52cef5655..a47d87220 100644
--- a/devicemodel/include/usb_core.h
+++ b/devicemodel/include/usb_core.h
@@ -221,7 +221,7 @@ enum USB_ERRCODE {
 #define NATIVE_USB2_SPEED "480"
 #define NATIVE_USB3_SPEED "5000"
 #define USB_NATIVE_NUM_PORT 20
-#define USB_NATIVE_NUM_BUS 4
+#define USB_NATIVE_NUM_BUS 5
 
 #define USB_DROPPED_XFER_MAGIC	0xaaaaaaaa55555555