1 files changed, 4 insertions, 0 deletions
diff --git a/struct.c b/struct.c
index 900f8bdbf6..4fab88fc0f 100644
--- a/struct.c
+++ b/struct.c
@@ -177,6 +177,10 @@ make_struct(name, member, klass)
 	if (!rb_is_const_id(id)) {
 	    rb_name_error(id, "identifier %s needs to be constant", cname);
 	}
+	if (rb_const_defined_at(klass, id)) {
+	    rb_warn("redefining constant Struct::%s", cname);
+	    rb_mod_remove_const(klass, ID2SYM(id));
+	}
 	nstr = rb_define_class_under(klass, cname, klass);
     }
     rb_iv_set(nstr, "__size__", LONG2NUM(RARRAY(member)->len));