diff --git a/include/bluetooth/audio/csis.h b/include/bluetooth/audio/csis.h
index 7bac1791fef..5c3ef86ce35 100644
--- a/include/bluetooth/audio/csis.h
+++ b/include/bluetooth/audio/csis.h
@@ -221,7 +221,8 @@ typedef void (*bt_csis_client_discover_cb)(struct bt_conn *conn, int err,
  *
  * @return int Return 0 on success, or an errno value on error.
  */
-int bt_csis_client_discover(struct bt_csis_client_set_member *member);
+int bt_csis_client_discover(struct bt_csis_client_set_member *member,
+			    struct bt_csis *csis[BT_CSIS_CLIENT_MAX_CSIS_INSTANCES]);
 
 typedef void (*bt_csis_client_discover_sets_cb)(struct bt_conn *conn,
 						int err, uint8_t set_count,