diff --git a/py/objset.c b/py/objset.c
index 08bcb70..3cb1929 100644
--- a/py/objset.c
+++ b/py/objset.c
@@ -67,7 +67,7 @@
         }
 
         default:
-            nlr_jump(mp_obj_new_exception_msg_1_arg(MP_QSTR_TypeError, "set takes at most 1 argument, %d given", (void*)(machine_int_t)n_args));
+            nlr_jump(mp_obj_new_exception_msg_varg(MP_QSTR_TypeError, "set takes at most 1 argument, %d given", n_args));
     }
 }