diff --git a/subsys/bluetooth/controller/hal/nrf5/rand.c b/subsys/bluetooth/controller/hal/nrf5/rand.c
index f573da0dc0d..0b59c4d1fde 100644
--- a/subsys/bluetooth/controller/hal/nrf5/rand.c
+++ b/subsys/bluetooth/controller/hal/nrf5/rand.c
@@ -143,7 +143,7 @@ void isr_rand(void *param)
 	ARG_UNUSED(param);
 
 	if (NRF_RNG->EVENTS_VALRDY) {
-		u8_t ret;
+		int ret;
 
 		ret = isr(rng_isr, true);
 		if (ret != -EBUSY) {