diff --git a/include/linux/timer.h b/include/linux/timer.h
index bd0af32..44d41e9 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -106,7 +106,7 @@
 extern void init_timers(void);
 extern void run_local_timers(void);
 struct hrtimer;
-extern int it_real_fn(struct hrtimer *);
+extern enum hrtimer_restart it_real_fn(struct hrtimer *);
 
 unsigned long __round_jiffies(unsigned long j, int cpu);
 unsigned long __round_jiffies_relative(unsigned long j, int cpu);