diff --git a/include/linux/swap.h b/include/linux/swap.h
index 4a99e4a..e53fef7 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -178,6 +178,7 @@
 
 #ifdef CONFIG_NUMA
 extern int zone_reclaim_mode;
+extern int zone_reclaim_interval;
 extern int zone_reclaim(struct zone *, gfp_t, unsigned int);
 #else
 #define zone_reclaim_mode 0