diff --git a/arch/x86/kernel/ds.c b/arch/x86/kernel/ds.c
index 24a323c95997..ab21c270bfa4 100644
--- a/arch/x86/kernel/ds.c
+++ b/arch/x86/kernel/ds.c
@@ -29,6 +29,7 @@
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/sched.h>
+#include <linux/mm.h>
 
 
 /*