diff --git a/object.c b/object.c
index 49729f644f..b50a3b949b 100644
--- a/object.c
+++ b/object.c
@@ -2332,7 +2332,7 @@ rb_mod_attr_writer(int argc, VALUE *argv, VALUE klass)
     for (i=0; i<argc; i++) {
 	ID id = id_for_attr(klass, argv[i]);
 	rb_attr(klass, id, FALSE, TRUE, TRUE);
-	rb_ary_push(names, rb_str_intern(rb_sprintf("%"PRIsVALUE"=", ID2SYM(id))));
+	rb_ary_push(names, ID2SYM(rb_id_attrset(id)));
     }
     return names;
 }
@@ -2363,11 +2363,10 @@ rb_mod_attr_accessor(int argc, VALUE *argv, VALUE klass)
 
     for (i=0; i<argc; i++) {
 	ID id = id_for_attr(klass, argv[i]);
-	VALUE idv = ID2SYM(id);
 
 	rb_attr(klass, id, TRUE, TRUE, TRUE);
-	rb_ary_push(names, idv);
-	rb_ary_push(names, rb_str_intern(rb_sprintf("%"PRIsVALUE"=", idv)));
+	rb_ary_push(names, ID2SYM(id));
+	rb_ary_push(names, ID2SYM(rb_id_attrset(id)));
     }
     return names;
 }