diff --git a/libraries/AP_HAL/AP_HAL_Boards.h b/libraries/AP_HAL/AP_HAL_Boards.h
index da8cf6611a..6f1e2bb6a9 100644
--- a/libraries/AP_HAL/AP_HAL_Boards.h
+++ b/libraries/AP_HAL/AP_HAL_Boards.h
@@ -253,3 +253,7 @@
 #define HAL_SUPPORT_RCOUT_SERIAL 0
 #endif
 
+
+#ifndef HAL_HAVE_DUAL_USB_CDC
+#define HAL_HAVE_DUAL_USB_CDC 0
+#endif