diff --git a/fs/compat.c b/fs/compat.c
index 8d0a001..fde52d4 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -45,6 +45,7 @@
 #include <linux/personality.h>
 #include <linux/rwsem.h>
 #include <linux/tsacct_kern.h>
+#include <linux/highmem.h>
 #include <linux/mm.h>
 
 #include <net/sock.h>		/* siocdevprivate_ioctl */