diff --git a/utils/mctp-in.c b/utils/mctp-in.c
index ce06bb4..43d96ec 100644
--- a/utils/mctp-in.c
+++ b/utils/mctp-in.c
@@ -32,7 +32,7 @@
 
 	mctp_serial_open_fd(serial, STDIN_FILENO);
 
-	mctp_serial_register_bus(serial, mctp, 8);
+	mctp_register_bus(mctp, mctp_binding_serial_core(serial), 8);
 
 	mctp_set_rx_all(mctp, rx_message, NULL);
 
diff --git a/utils/mctp-pipe.c b/utils/mctp-pipe.c
index 45ff886..3c4c316 100644
--- a/utils/mctp-pipe.c
+++ b/utils/mctp-pipe.c
@@ -43,8 +43,8 @@
 	mctp_serial_open_fd(serial[0], mctp_fds[0]);
 	mctp_serial_open_fd(serial[1], mctp_fds[1]);
 
-	mctp_serial_register_bus(serial[0], mctp[0], eids[0]);
-	mctp_serial_register_bus(serial[1], mctp[1], eids[1]);
+	mctp_register_bus(mctp[0], mctp_binding_serial_core(serial[0]), eids[0]);
+	mctp_register_bus(mctp[1], mctp_binding_serial_core(serial[1]), eids[1]);
 
 	mctp_set_rx_all(mctp[1], rx_message, NULL);