diff --git a/include/linux/rtc.h b/include/linux/rtc.h
index 4046b75..60f88a7 100644
--- a/include/linux/rtc.h
+++ b/include/linux/rtc.h
@@ -99,6 +99,7 @@
 
 #ifdef __KERNEL__
 
+#include <linux/types.h>
 #include <linux/interrupt.h>
 
 extern int rtc_month_days(unsigned int month, unsigned int year);
@@ -232,6 +233,11 @@
 int rtc_unregister(rtc_task_t *task);
 int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg);
 
+static inline bool is_leap_year(unsigned int year)
+{
+	return (!(year % 4) && (year % 100)) || !(year % 400);
+}
+
 #endif /* __KERNEL__ */
 
 #endif /* _LINUX_RTC_H_ */