diff --git a/binding-sandbox/binding-util.h b/binding-sandbox/binding-util.h
index 50c0ff9a..0ac15a13 100644
--- a/binding-sandbox/binding-util.h
+++ b/binding-sandbox/binding-util.h
@@ -121,9 +121,9 @@ namespace mkxp_sandbox {
     )
 
     SANDBOX_COROUTINE(wrap_property,
-        VALUE operator()(VALUE self, void *ptr, const char *iv, VALUE klass) {
-            VALUE obj;
+        VALUE obj;
 
+        VALUE operator()(VALUE self, void *ptr, const char *iv, VALUE klass) {
             BOOST_ASIO_CORO_REENTER (this) {
                 SANDBOX_AWAIT_AND_SET(obj, rb_obj_alloc, klass);
                 set_private_data(obj, ptr);