diff --git a/include/libopencm3/usb/msc.h b/include/libopencm3/usb/msc.h
index 2c52bb02..1317b2a7 100644
--- a/include/libopencm3/usb/msc.h
+++ b/include/libopencm3/usb/msc.h
@@ -41,6 +41,7 @@ LGPL License Terms @ref lgpl_license
 #define __MSC_H
 
 #include <stdint.h>
+#include <libopencm3/usb/usbd.h>
 
 typedef struct _usbd_mass_storage usbd_mass_storage;