diff --git a/arch b/arch
index c71c24971d..c4f77e7d87 160000
--- a/arch
+++ b/arch
@@ -1 +1 @@
-Subproject commit c71c24971d1ff233a59a85c7ad65c81bdaeaa60b
+Subproject commit c4f77e7d8721f62631c4e90aeb4629db9c7cbee0
diff --git a/drivers/timers/rtc.c b/drivers/timers/rtc.c
index ae1bd96899..62453c1c20 100644
--- a/drivers/timers/rtc.c
+++ b/drivers/timers/rtc.c
@@ -577,7 +577,7 @@ int rtc_initialize(int minor, FAR struct rtc_lowerhalf_s *lower)
 
   /* Allocate an upper half container structure */
 
-  upper = (FAR struct rtc_upperhalf_s *)kmm_malloc(sizeof(struct rtc_upperhalf_s));
+  upper = (FAR struct rtc_upperhalf_s *)kmm_zalloc(sizeof(struct rtc_upperhalf_s));
   if (!upper)
     {
       return -ENOMEM;