diff --git a/mrbgems/mruby-struct/src/struct.c b/mrbgems/mruby-struct/src/struct.c
index a40b7d9b0..6e8887f16 100644
--- a/mrbgems/mruby-struct/src/struct.c
+++ b/mrbgems/mruby-struct/src/struct.c
@@ -619,7 +619,7 @@ mrb_struct_to_h(mrb_state *mrb, mrb_value self)
   ret = mrb_hash_new_capa(mrb, RARRAY_LEN(members));
 
   for (i = 0; i < RARRAY_LEN(members); i++) {
-    mrb_hash_set(mrb, ret, RARRAY_PTR(members)[i], RSTRUCT_PTR(self)[i]);
+    mrb_hash_set(mrb, ret, RARRAY_PTR(members)[i], mrb_ary_ref(mrb, self, i));
   }
 
   return ret;