1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/usb/cdc.h b/include/linux/usb/cdc.h
index 94ee4ecf0564..71e52f2f6a38 100644
--- a/include/linux/usb/cdc.h
+++ b/include/linux/usb/cdc.h
@@ -6,6 +6,9 @@
  * firmware based USB peripherals.
  */
 
+#ifndef __LINUX_USB_CDC_H
+#define __LINUX_USB_CDC_H
+
 #define USB_CDC_SUBCLASS_ACM                    0x02
 #define USB_CDC_SUBCLASS_ETHERNET               0x06
 #define USB_CDC_SUBCLASS_WHCM                   0x08
@@ -221,3 +224,4 @@ struct usb_cdc_notification {
         __le16  wLength;
 } __attribute__ ((packed));
 
+#endif /* __LINUX_USB_CDC_H */