diff --git a/monitor/bt.h b/monitor/bt.h
index 75bcdee..ba17b94 100644
--- a/monitor/bt.h
+++ b/monitor/bt.h
@@ -1510,7 +1510,9 @@ struct bt_hci_evt_le_long_term_key_request {
 #define BT_HCI_ERR_HARDWARE_FAILURE		0x03
 #define BT_HCI_ERR_PAGE_TIMEOUT			0x04
 #define BT_HCI_ERR_COMMAND_DISALLOWED		0x0c
+#define BT_HCI_ERR_UNSUPPORTED_FEATURE		0x11
 #define BT_HCI_ERR_INVALID_PARAMETERS		0x12
+#define BT_HCI_ERR_UNSPECIFIED_ERROR		0x1f
 
 struct bt_l2cap_hdr {
 	uint16_t len;