diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index 9458e6d6686a..970b19c0fead 100644
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -375,6 +375,11 @@ int __rtc_register_device(struct module *owner, struct rtc_device *rtc)
 	dev_info(rtc->dev.parent, "registered as %s\n",
 		 dev_name(&rtc->dev));
 
+#ifdef CONFIG_RTC_HCTOSYS_DEVICE
+	if (!strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE))
+		rtc_hctosys();
+#endif
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(__rtc_register_device);
diff --git a/drivers/rtc/hctosys.c b/drivers/rtc/hctosys.c
index a74d0d890600..e3a4f2646f8b 100644
--- a/drivers/rtc/hctosys.c
+++ b/drivers/rtc/hctosys.c
@@ -21,7 +21,7 @@
  * the best guess is to add 0.5s.
  */
 
-static int __init rtc_hctosys(void)
+int rtc_hctosys(void)
 {
 	int err = -ENODEV;
 	struct rtc_time tm;
@@ -65,5 +65,3 @@ static int __init rtc_hctosys(void)
 
 	return err;
 }
-
-late_initcall(rtc_hctosys);
diff --git a/drivers/rtc/rtc-core.h b/drivers/rtc/rtc-core.h
index 0abf98983e13..c38ef33a4bff 100644
--- a/drivers/rtc/rtc-core.h
+++ b/drivers/rtc/rtc-core.h
@@ -46,3 +46,7 @@ static inline const struct attribute_group **rtc_get_dev_attribute_groups(void)
 	return NULL;
 }
 #endif
+
+#ifdef CONFIG_RTC_HCTOSYS
+extern int rtc_hctosys(void);
+#endif