diff --git a/src/main/target/common_post.h b/src/main/target/common_post.h
index 0ac16b6b94..fc4e504d47 100644
--- a/src/main/target/common_post.h
+++ b/src/main/target/common_post.h
@@ -236,6 +236,10 @@
 #endif
 #endif
 
+#ifndef USE_BLACKBOX
+#undef USE_USB_MSC
+#endif
+
 #if (!defined(USE_FLASHFS) || !defined(USE_RTC_TIME) || !defined(USE_USB_MSC))
 #undef USE_PERSISTENT_MSC_RTC
 #endif