diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 07d7305..e4bccbc 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -91,6 +91,7 @@
 	ktime_t			(*get_softirq_time)(void);
 	struct hrtimer		*curr_timer;
 	ktime_t			softirq_time;
+	struct lock_class_key lock_key;
 };
 
 /*