diff --git a/sound/oss/dmabuf.c b/sound/oss/dmabuf.c
index b256c04..eaf6997 100644
--- a/sound/oss/dmabuf.c
+++ b/sound/oss/dmabuf.c
@@ -25,6 +25,7 @@
 #define BE_CONSERVATIVE
 #define SAMPLE_ROUNDUP 0
 
+#include <linux/mm.h>
 #include "sound_config.h"
 
 #define DMAP_FREE_ON_CLOSE      0