diff --git a/include/libopencm3/usb/dfu.h b/include/libopencm3/usb/dfu.h
index 1d0fc3f1..bf9139e1 100644
--- a/include/libopencm3/usb/dfu.h
+++ b/include/libopencm3/usb/dfu.h
@@ -38,6 +38,8 @@ LGPL License Terms @ref lgpl_license
 #ifndef __DFU_H
 #define __DFU_H
 
+#include <stdint.h>
+
 #define USB_CLASS_DFU 0xFE
 
 enum dfu_req {
diff --git a/include/libopencm3/usb/msc.h b/include/libopencm3/usb/msc.h
index cf9c54a6..2c52bb02 100644
--- a/include/libopencm3/usb/msc.h
+++ b/include/libopencm3/usb/msc.h
@@ -40,6 +40,8 @@ LGPL License Terms @ref lgpl_license
 #ifndef __MSC_H
 #define __MSC_H
 
+#include <stdint.h>
+
 typedef struct _usbd_mass_storage usbd_mass_storage;
 
 /* Definitions of Mass Storage Class from: