diff --git a/firmware/baseband/sd_over_usb/scsi.c b/firmware/baseband/sd_over_usb/scsi.c
index 3c05be035..a71e1c0b6 100644
--- a/firmware/baseband/sd_over_usb/scsi.c
+++ b/firmware/baseband/sd_over_usb/scsi.c
@@ -27,6 +27,7 @@
 #include <libopencm3/lpc43xx/rgu.h>
 #include <libopencm3/lpc43xx/wwdt.h>
 #include "delay.h"
+#include "string.h"
 
 volatile bool usb_bulk_block_done = false;