diff --git a/net/can/isotp.c b/net/can/isotp.c
index d34f9ab2eb62..009d5216f3ea 100644
--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -1550,7 +1550,7 @@ static __init int isotp_module_init(void)
 
 	err = can_proto_register(&isotp_can_proto);
 	if (err < 0)
-		pr_err("can: registration of isotp protocol failed\n");
+		pr_err("can: registration of isotp protocol failed %pe\n", ERR_PTR(err));
 	else
 		register_netdevice_notifier(&canisotp_notifier);