diff --git a/library/include/DataDefs.h b/library/include/DataDefs.h
index e03e9a0a8..c440c1eb7 100644
--- a/library/include/DataDefs.h
+++ b/library/include/DataDefs.h
@@ -265,6 +265,7 @@ namespace DFHack
         type_identity *ref_target;
         const char *union_tag_field;
         const char *union_tag_attr;
+        const char *original_name;
     };
 
     struct struct_field_info {