diff --git a/subsys/bluetooth/controller/ll_sw/ctrl.c b/subsys/bluetooth/controller/ll_sw/ctrl.c
index 742efc88d77..92c95acd00e 100644
--- a/subsys/bluetooth/controller/ll_sw/ctrl.c
+++ b/subsys/bluetooth/controller/ll_sw/ctrl.c
@@ -1498,6 +1498,7 @@ isr_rx_conn_pkt_ctrl_rej_conn_upd(struct radio_pdu_node_rx *radio_pdu_node_rx,
 	}
 }
 
+#if defined(CONFIG_BLUETOOTH_CONTROLLER_PHY)
 static inline void
 isr_rx_conn_pkt_ctrl_rej_phy_upd(struct radio_pdu_node_rx *radio_pdu_node_rx,
 				 u8_t *rx_enqueue)
@@ -1541,6 +1542,7 @@ isr_rx_conn_pkt_ctrl_rej_phy_upd(struct radio_pdu_node_rx *radio_pdu_node_rx,
 		}
 	}
 }
+#endif /* CONFIG_BLUETOOTH_CONTROLLER_PHY */
 
 static inline void
 isr_rx_conn_pkt_ctrl_rej(struct radio_pdu_node_rx *radio_pdu_node_rx,