diff --git a/drivers/char/hw_random/optee-rng.c b/drivers/char/hw_random/optee-rng.c
index 46f4bcd28c41..d3581ce85cb3 100644
--- a/drivers/char/hw_random/optee-rng.c
+++ b/drivers/char/hw_random/optee-rng.c
@@ -73,7 +73,7 @@ struct optee_rng_private {
 static size_t get_optee_rng_data(struct optee_rng_private *pvt_data,
 				 void *buf, size_t req_size)
 {
-	u32 ret = 0;
+	int ret = 0;
 	u8 *rng_data = NULL;
 	size_t rng_size = 0;
 	struct tee_ioctl_invoke_arg inv_arg;
@@ -175,7 +175,7 @@ static struct optee_rng_private pvt_data = {
 
 static int get_optee_rng_info(struct device *dev)
 {
-	u32 ret = 0;
+	int ret = 0;
 	struct tee_ioctl_invoke_arg inv_arg;
 	struct tee_param param[4];