diff --git a/subsys/bluetooth/controller/ll_sw/openisa/hal/RV32M1/radio/radio.c b/subsys/bluetooth/controller/ll_sw/openisa/hal/RV32M1/radio/radio.c
index 6345d6e51f3..9ba95d209b2 100644
--- a/subsys/bluetooth/controller/ll_sw/openisa/hal/RV32M1/radio/radio.c
+++ b/subsys/bluetooth/controller/ll_sw/openisa/hal/RV32M1/radio/radio.c
@@ -167,8 +167,10 @@ static void pkt_rx(void)
 #define IRQ_MASK ~(GENFSK_IRQ_CTRL_T2_IRQ_MASK | \
 		   GENFSK_IRQ_CTRL_RX_WATERMARK_IRQ_MASK | \
 		   GENFSK_IRQ_CTRL_TX_IRQ_MASK)
-void isr_radio(void)
+void isr_radio(void *arg)
 {
+	ARG_UNUSED(arg);
+
 	u32_t tmr = GENFSK->EVENT_TMR & GENFSK_EVENT_TMR_EVENT_TMR_MASK;
 	u32_t irq = GENFSK->IRQ_CTRL;
 
diff --git a/subsys/bluetooth/controller/ll_sw/openisa/hal/RV32M1/radio/radio.h b/subsys/bluetooth/controller/ll_sw/openisa/hal/RV32M1/radio/radio.h
index b5ed43c340a..68bb5bb0c16 100644
--- a/subsys/bluetooth/controller/ll_sw/openisa/hal/RV32M1/radio/radio.h
+++ b/subsys/bluetooth/controller/ll_sw/openisa/hal/RV32M1/radio/radio.h
@@ -10,7 +10,7 @@
 
 typedef void (*radio_isr_cb_t) (void *param);
 
-void isr_radio(void);
+void isr_radio(void *arg);
 void radio_isr_set(radio_isr_cb_t cb, void *param);
 
 void radio_setup(void);