diff --git a/sound/sound_firmware.c b/sound/sound_firmware.c
index 3304344..96deaef 100644
--- a/sound/sound_firmware.c
+++ b/sound/sound_firmware.c
@@ -3,6 +3,7 @@
 #include <linux/fs.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
+#include <linux/sched.h>
 #include <asm/uaccess.h>
 #include "oss/sound_firmware.h"