diff --git a/drivers/power/pmic/rk8xx.c b/drivers/power/pmic/rk8xx.c
index 09b9b54..eb3ec0f 100644
--- a/drivers/power/pmic/rk8xx.c
+++ b/drivers/power/pmic/rk8xx.c
@@ -111,6 +111,7 @@
 #if CONFIG_IS_ENABLED(PMIC_CHILDREN)
 	.bind = rk8xx_bind,
 #endif
+	.priv_auto_alloc_size   = sizeof(struct rk8xx_priv),
 	.probe = rk8xx_probe,
 	.ops = &rk8xx_ops,
 };