diff --git a/sound/oss/sscape.c b/sound/oss/sscape.c
index 51f2fa6..30c36d1 100644
--- a/sound/oss/sscape.c
+++ b/sound/oss/sscape.c
@@ -39,6 +39,7 @@
 #include <linux/ioport.h>
 #include <linux/delay.h>
 #include <linux/proc_fs.h>
+#include <linux/mm.h>
 #include <linux/spinlock.h>
 
 #include "coproc.h"