diff --git a/net/can/isotp.c b/net/can/isotp.c
index 2c4f84fac70a..2075d8d9e6b6 100644
--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -1433,7 +1433,7 @@ 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));
 
 	return err;
 }