diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 6b9aaf1afc72088737bbb111e5684731fc3bb7d2..2183fd2750abd9d4b388ca4a5f48916600356122 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -313,7 +313,7 @@ static const struct rtc_class_ops at91_rtc_ops = {
 	.alarm_irq_enable = at91_rtc_alarm_irq_enable,
 };
 
-static struct regmap_config gpbr_regmap_config = {
+static const struct regmap_config gpbr_regmap_config = {
 	.reg_bits = 32,
 	.val_bits = 32,
 	.reg_stride = 4,