diff --git a/arch b/arch
index f9a3a1463b2..a8666b5bb68 160000
--- a/arch
+++ b/arch
@@ -1 +1 @@
-Subproject commit f9a3a1463b24b8da63f2a7577d0b4ce0131a1069
+Subproject commit a8666b5bb6841d514d1fccedb0071df38d78217a
diff --git a/drivers/timers/pcf85263.c b/drivers/timers/pcf85263.c
index 8d5db98e6d4..ab89fd47158 100644
--- a/drivers/timers/pcf85263.c
+++ b/drivers/timers/pcf85263.c
@@ -408,6 +408,7 @@ int up_rtc_settime(FAR const struct timespec *tp)
   struct tm newtm;
   time_t newtime;
   uint8_t buffer[9];
+  uint8_t cmd;
   uint8_t seconds;
   int ret;
 
@@ -449,7 +450,7 @@ int up_rtc_settime(FAR const struct timespec *tp)
   rtc_dumptime(&tm, "New time");
 
   /* Construct the message */
-  /* Write starting with the seconds regiser */
+  /* Write starting with the 100ths of seconds register */
 
   buffer[0] = PCF85263_RTC_100TH_SECONDS;
 
@@ -498,9 +499,11 @@ int up_rtc_settime(FAR const struct timespec *tp)
 
   /* Read back the seconds register */
 
+  cmd           = PCF85263_RTC_SECONDS;
+
   msg[1].addr   = PCF85263_I2C_ADDRESS;
   msg[1].flags  = 0;
-  msg[1].buffer = buffer;
+  msg[1].buffer = &cmd;
   msg[1].length = 1;
 
   msg[2].addr   = PCF85263_I2C_ADDRESS;