diff --git a/drivers/soc/renesas/r9a09g056-sys.c b/drivers/soc/renesas/r9a09g056-sys.c
index 3ad1422eba36..16b4e433c337 100644
--- a/drivers/soc/renesas/r9a09g056-sys.c
+++ b/drivers/soc/renesas/r9a09g056-sys.c
@@ -72,4 +72,5 @@ static const struct rz_sysc_soc_id_init_data rzv2n_sys_soc_id_init_data __initco
 
 const struct rz_sysc_init_data rzv2n_sys_init_data = {
 	.soc_id_init_data = &rzv2n_sys_soc_id_init_data,
+	.max_register = 0x170c,
 };