diff --git a/include/linux/sched.h b/include/linux/sched.h
index ebf7095..af008d7 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1862,6 +1862,7 @@
 
 #ifdef CONFIG_NO_HZ_FULL
 extern bool sched_can_stop_tick(void);
+extern u64 scheduler_tick_max_deferment(void);
 #else
 static inline bool sched_can_stop_tick(void) { return false; }
 #endif