diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 4b2b4627daebfb89b77121d499110d7f553a7394..71396b62dc52b230fe33e87ae4ac235cb8e16bde 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -1384,7 +1384,6 @@ static void ds1307_clks_register(struct ds1307 *ds1307)
 static const struct regmap_config regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
-	.max_register = 0x9,
 };
 
 static int ds1307_probe(struct i2c_client *client,