diff --git a/irtoc_scripts/object.irt b/irtoc_scripts/object.irt
index 48ec6cced205e8085d0dcf565f4b4f1c55158281..f91f898b8a614f72bc75b25dd4f51a5ea9856f89 100644
--- a/irtoc_scripts/object.irt
+++ b/irtoc_scripts/object.irt
@@ -71,7 +71,7 @@ scoped_macro(:prop_get_sorted_index) do |attributes|
 end
 
 scoped_macro(:layout_info_get_sorted_index) do |layout, index|
-  attributes := get_prop_attr(layout, index)
+  attributes := anytoi32(get_prop_attr(layout, index))
   prop_get_sorted_index(attributes)
 end