1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 86c61f143515..78a018b5c941 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -161,7 +161,7 @@ static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
         if (offset == 0)
                 return -EILSEQ;
 
-        memset(alrm, 0, sizeof(alrm));
+        memset(alrm, 0, sizeof(*alrm));
         if (alarm != ALARM_DISABLED && offset != 0) {
                 rtc_time_to_tm(offset + alarm, tm);