diff --git a/arch/arm/src/stm32/stm32_rtc_lowerhalf.c b/arch/arm/src/stm32/stm32_rtc_lowerhalf.c
index 8f2b74ace99..6a445b80f9f 100644
--- a/arch/arm/src/stm32/stm32_rtc_lowerhalf.c
+++ b/arch/arm/src/stm32/stm32_rtc_lowerhalf.c
@@ -727,8 +727,8 @@ static int stm32_rdalarm(FAR struct rtc_lowerhalf_s *lower,
 
       sched_lock();
 
-      lowerinfo.as_id = alarminfo->id;
-      lowerinfo.as_time = alarminfo->time;
+      lowerinfo.ar_id   = alarminfo->id;
+      lowerinfo.ar_time = alarminfo->time;
 
       ret = stm32_rtc_rdalarm(&lowerinfo);
 
diff --git a/arch/arm/src/stm32/stm32f40xxx_alarm.h b/arch/arm/src/stm32/stm32f40xxx_alarm.h
index 353fbc0b11c..cd45cbc1c8a 100644
--- a/arch/arm/src/stm32/stm32f40xxx_alarm.h
+++ b/arch/arm/src/stm32/stm32f40xxx_alarm.h
@@ -77,8 +77,8 @@ struct alm_setalarm_s
 
 struct alm_rdalarm_s
 {
-  int as_id;                    /* enum alm_id_e */
-  FAR struct rtc_time *as_time; /* Argument for storing ALARM RTC time */
+  int ar_id;                    /* enum alm_id_e */
+  FAR struct rtc_time *ar_time; /* Argument for storing ALARM RTC time */
 };
 
 /****************************************************************************
diff --git a/arch/arm/src/stm32/stm32f40xxx_rtcc.c b/arch/arm/src/stm32/stm32f40xxx_rtcc.c
index 2d780f876a7..db2e7e232be 100644
--- a/arch/arm/src/stm32/stm32f40xxx_rtcc.c
+++ b/arch/arm/src/stm32/stm32f40xxx_rtcc.c
@@ -1617,15 +1617,15 @@ int stm32_rtc_rdalarm(FAR struct alm_rdalarm_s *alminfo)
   int ret = -EINVAL;
 
   ASSERT(alminfo != NULL);
-  DEBUGASSERT(RTC_ALARM_LAST > alminfo->as_id);
+  DEBUGASSERT(RTC_ALARM_LAST > alminfo->ar_id);
 
-  switch (alminfo->as_id)
+  switch (alminfo->ar_id)
     {
       case RTC_ALARMA:
         {
           alarmreg = STM32_RTC_ALRMAR;
           ret = stm32_rtc_getalarmdatetime(alarmreg,
-                                           (struct tm *)alminfo->as_time);
+                                           (struct tm *)alminfo->ar_time);
         }
         break;
 
@@ -1633,12 +1633,12 @@ int stm32_rtc_rdalarm(FAR struct alm_rdalarm_s *alminfo)
         {
           alarmreg = STM32_RTC_ALRMBR;
           ret = stm32_rtc_getalarmdatetime(alarmreg,
-                                          (struct tm *)alminfo->as_time);
+                                          (struct tm *)alminfo->ar_time);
         }
         break;
 
       default:
-        rtcerr("ERROR: Invalid ALARM%d\n", alminfo->as_id);
+        rtcerr("ERROR: Invalid ALARM%d\n", alminfo->ar_id);
         break;
     }
 
diff --git a/arch/arm/src/stm32f7/stm32_alarm.h b/arch/arm/src/stm32f7/stm32_alarm.h
index a898f074784..a2d8c297cdd 100644
--- a/arch/arm/src/stm32f7/stm32_alarm.h
+++ b/arch/arm/src/stm32f7/stm32_alarm.h
@@ -76,8 +76,8 @@ struct alm_setalarm_s
 
 struct alm_rdalarm_s
 {
-  int as_id;                    /* enum alm_id_e */
-  FAR struct rtc_time *as_time; /* Argument for storing ALARM RTC time */
+  int ar_id;                    /* enum alm_id_e */
+  FAR struct rtc_time *ar_time; /* Argument for storing ALARM RTC time */
 };
 
 /****************************************************************************
diff --git a/arch/arm/src/stm32f7/stm32_rtc.c b/arch/arm/src/stm32f7/stm32_rtc.c
index 97762f4d5ad..42e4d0af8a0 100644
--- a/arch/arm/src/stm32f7/stm32_rtc.c
+++ b/arch/arm/src/stm32f7/stm32_rtc.c
@@ -1624,15 +1624,15 @@ int stm32_rtc_rdalarm(FAR struct alm_rdalarm_s *alminfo)
   int ret = -EINVAL;
 
   ASSERT(alminfo != NULL);
-  DEBUGASSERT(RTC_ALARM_LAST > alminfo->as_id);
+  DEBUGASSERT(RTC_ALARM_LAST > alminfo->ar_id);
 
-  switch (alminfo->as_id)
+  switch (alminfo->ar_id)
     {
       case RTC_ALARMA:
         {
           alarmreg = STM32_RTC_ALRMAR;
           ret = stm32_rtc_getalarmdatetime(alarmreg,
-                                           (struct tm *)alminfo->as_time);
+                                           (struct tm *)alminfo->ar_time);
         }
         break;
 
@@ -1640,12 +1640,12 @@ int stm32_rtc_rdalarm(FAR struct alm_rdalarm_s *alminfo)
         {
           alarmreg = STM32_RTC_ALRMBR;
           ret = stm32_rtc_getalarmdatetime(alarmreg,
-                                          (struct tm *)alminfo->as_time);
+                                          (struct tm *)alminfo->ar_time);
         }
         break;
 
       default:
-        rtcerr("ERROR: Invalid ALARM%d\n", alminfo->as_id);
+        rtcerr("ERROR: Invalid ALARM%d\n", alminfo->ar_id);
         break;
     }
 
diff --git a/arch/arm/src/stm32f7/stm32_rtc_lowerhalf.c b/arch/arm/src/stm32f7/stm32_rtc_lowerhalf.c
index 6812a0fdcb3..03a0d518f28 100644
--- a/arch/arm/src/stm32f7/stm32_rtc_lowerhalf.c
+++ b/arch/arm/src/stm32f7/stm32_rtc_lowerhalf.c
@@ -556,8 +556,8 @@ static int stm32_rdalarm(FAR struct rtc_lowerhalf_s *lower,
 
       sched_lock();
 
-      lowerinfo.as_id = alarminfo->id;
-      lowerinfo.as_time = alarminfo->time;
+      lowerinfo.ar_id = alarminfo->id;
+      lowerinfo.ar_time = alarminfo->time;
 
       ret = stm32_rtc_rdalarm(&lowerinfo);
 
diff --git a/arch/arm/src/stm32l4/stm32l4_rtc.h b/arch/arm/src/stm32l4/stm32l4_rtc.h
index de363ba41d2..d988c0c1756 100644
--- a/arch/arm/src/stm32l4/stm32l4_rtc.h
+++ b/arch/arm/src/stm32l4/stm32l4_rtc.h
@@ -90,8 +90,8 @@ struct alm_setalarm_s
 
 struct alm_rdalarm_s
 {
-  int as_id;                    /* enum alm_id_e */
-  FAR struct rtc_time *as_time; /* Argument for storing ALARM RTC time */
+  int ar_id;                    /* enum alm_id_e */
+  FAR struct rtc_time *ar_time; /* Argument for storing ALARM RTC time */
 };
 
 #endif /* CONFIG_RTC_ALARM */
diff --git a/arch/arm/src/stm32l4/stm32l4_rtc_lowerhalf.c b/arch/arm/src/stm32l4/stm32l4_rtc_lowerhalf.c
index 9f499eb6f8b..1abb96583e3 100644
--- a/arch/arm/src/stm32l4/stm32l4_rtc_lowerhalf.c
+++ b/arch/arm/src/stm32l4/stm32l4_rtc_lowerhalf.c
@@ -533,8 +533,8 @@ static int stm32l4_rdalarm(FAR struct rtc_lowerhalf_s *lower,
 
       sched_lock();
 
-      lowerinfo.as_id = alarminfo->id;
-      lowerinfo.as_time = alarminfo->time;
+      lowerinfo.ar_id = alarminfo->id;
+      lowerinfo.ar_time = alarminfo->time;
 
       ret = stm32l4_rtc_rdalarm(&lowerinfo);
 
diff --git a/arch/arm/src/stm32l4/stm32l4_rtcc.c b/arch/arm/src/stm32l4/stm32l4_rtcc.c
index 5fbab089611..7cdfc186f77 100644
--- a/arch/arm/src/stm32l4/stm32l4_rtcc.c
+++ b/arch/arm/src/stm32l4/stm32l4_rtcc.c
@@ -1544,15 +1544,15 @@ int stm32l4_rtc_rdalarm(FAR struct alm_rdalarm_s *alminfo)
   int ret = -EINVAL;
 
   ASSERT(alminfo != NULL);
-  DEBUGASSERT(RTC_ALARM_LAST > alminfo->as_id);
+  DEBUGASSERT(RTC_ALARM_LAST > alminfo->ar_id);
 
-  switch (alminfo->as_id)
+  switch (alminfo->ar_id)
     {
       case RTC_ALARMA:
         {
           alarmreg = STM32L4_RTC_ALRMAR;
           ret = stm32l4_rtc_getalarmdatetime(alarmreg,
-                                             (struct tm *)alminfo->as_time);
+                                             (struct tm *)alminfo->ar_time);
         }
         break;
 
@@ -1560,12 +1560,12 @@ int stm32l4_rtc_rdalarm(FAR struct alm_rdalarm_s *alminfo)
         {
           alarmreg = STM32L4_RTC_ALRMBR;
           ret = stm32l4_rtc_getalarmdatetime(alarmreg,
-                                             (struct tm *)alminfo->as_time);
+                                             (struct tm *)alminfo->ar_time);
         }
         break;
 
       default:
-        rtcerr("ERROR: Invalid ALARM%d\n", alminfo->as_id);
+        rtcerr("ERROR: Invalid ALARM%d\n", alminfo->ar_id);
         break;
     }