diff --git a/firmware/libboard/owhw/source/owhw.c b/firmware/libboard/owhw/source/owhw.c
index be62660..3bf51ec 100644
--- a/firmware/libboard/owhw/source/owhw.c
+++ b/firmware/libboard/owhw/source/owhw.c
@@ -21,6 +21,7 @@
 #include "chip.h"
 #include "board.h"
 #include "utils.h"
+#include "usb_buf.h"
 
 static const Pin pins_cardsim[] = PINS_CARDSIM;
 
@@ -42,6 +43,13 @@
 	}
 }
 
+void board_main_top(void)
+{
+#ifndef APPLICATION_dfu
+	usb_buf_init();
+#endif
+}
+
 void cardsim_set_simpres(uint8_t slot, int present)
 {
 	if (slot > 1)