diff --git a/lib/rbx_loader/src/union.rs b/lib/rbx_loader/src/union.rs
index 5e7cf46..10a4785 100644
--- a/lib/rbx_loader/src/union.rs
+++ b/lib/rbx_loader/src/union.rs
@@ -114,7 +114,7 @@ pub fn convert(
 				panic!("Empty face!");
 			}
 		}
-		(0..polygon_groups_normal_id.len()).map(|polygon_group_id|{
+		(0..NORMAL_FACES).map(|polygon_group_id|{
 			model::IndexedGraphicsGroup{
 				render:RenderConfigId::new(0),
 				groups:vec![PolygonGroupId::new(polygon_group_id as u32)]