diff --git a/src/protocol/eval/value.rs b/src/protocol/eval/value.rs
index a6fe4c77fe73edefead5449a99c6b78ca8bfc5f7..d08d327fecbb3faaaa79ae2c9b7629ebb8ba8a4e 100644
--- a/src/protocol/eval/value.rs
+++ b/src/protocol/eval/value.rs
@@ -1,7 +1,6 @@
 use std::collections::VecDeque;
 
 use super::store::*;
-use crate::PortId;
 use crate::protocol::ast::{
     AssignmentOperator,
     BinaryOperator,
@@ -20,6 +19,17 @@ pub enum ValueId {
     Heap(HeapPos, u32), // allocated region + values within that region
 }
 
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub struct PortId{
+    pub(crate) id: u32
+}
+
+impl PortId {
+    pub fn new(id: u32) -> Self {
+        return Self{ id };
+    }
+}
+
 /// Represents a value stored on the stack or on the heap. Some values contain
 /// a `HeapPos`, implying that they're stored in the store's `Heap`. Clearing
 /// a `Value` with a `HeapPos` from a stack must also clear the associated