diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index 6a7621b..f5fdca1 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -36,6 +36,7 @@
 #include <linux/nodemask.h>
 
 struct vm_area_struct;
+struct mm_struct;
 
 #ifdef CONFIG_NUMA