diff --git a/src/runtime/mod.rs b/src/runtime/mod.rs
index 9ec89b0f5297a3c6ce716fa2f581c642d475f56e..c96f4d21929db539d7f77c8ff70c5cc614c847bc 100644
--- a/src/runtime/mod.rs
+++ b/src/runtime/mod.rs
@@ -70,7 +70,6 @@ pub(crate) struct SyncProtoContext<'a> {
 // access control.
 #[derive(Default, Debug, Clone)]
 struct ProtoComponentBranchInner {
-    untaken_choice: Option<u16>,
     did_put_or_get: HashSet<PortId>,
     inbox: HashMap<PortId, Payload>,
 }