diff --git a/osmo-gtm900/usb_descriptors.c b/osmo-gtm900/usb_descriptors.c
index 1ff6a4a..8944497 100644
--- a/osmo-gtm900/usb_descriptors.c
+++ b/osmo-gtm900/usb_descriptors.c
@@ -1,3 +1,4 @@
+#include <hardware/flash.h>
 #include "tusb.h"
 #include "class/audio/audio.h"
 #include "usb_descriptors.h"