diff --git a/src/indexing.rs b/src/indexing.rs
index be6d7260..286f618a 100644
--- a/src/indexing.rs
+++ b/src/indexing.rs
@@ -28,6 +28,7 @@ pub(crate) enum IndexingCodePtr {
 enum OptArgIndexKeyType {
     Structure,
     Constant,
+    #[allow(dead_code)]
     List,
 }