diff --git a/media/mtp/MtpDevice.h b/media/mtp/MtpDevice.h
index 9b05197..e41a872 100644
--- a/media/mtp/MtpDevice.h
+++ b/media/mtp/MtpDevice.h
@@ -22,6 +22,8 @@
 #include "MtpResponsePacket.h"
 #include "MtpTypes.h"
 
+struct usb_device;
+
 namespace android {
 
 class MtpDeviceInfo;