diff --git a/include/linux/usb/sl811.h b/include/linux/usb/sl811.h
index 877373d..3afe4d1 100644
--- a/include/linux/usb/sl811.h
+++ b/include/linux/usb/sl811.h
@@ -1,9 +1,11 @@
-
 /*
  * board initialization should put one of these into dev->platform_data
  * and place the sl811hs onto platform_bus named "sl811-hcd".
  */
 
+#ifndef __LINUX_USB_SL811_H
+#define __LINUX_USB_SL811_H
+
 struct sl811_platform_data {
 	unsigned	can_wakeup:1;
 
@@ -24,3 +26,4 @@
 	/* void		(*clock_enable)(struct device *dev, int is_on); */
 };
 
+#endif /* __LINUX_USB_SL811_H */