diff --git a/drivers/staging/cx25821/cx25821-video.c b/drivers/staging/cx25821/cx25821-video.c
index 998c33acf7bd5..0d8d75670516e 100644
--- a/drivers/staging/cx25821/cx25821-video.c
+++ b/drivers/staging/cx25821/cx25821-video.c
@@ -27,6 +27,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include "cx25821-video.h"
+#include <linux/smp_lock.h>
 
 MODULE_DESCRIPTION("v4l2 driver module for cx25821 based TV cards");
 MODULE_AUTHOR("Hiep Huynh <hiep.huynh@conexant.com>");