diff --git a/src/protocol/eval/executor.rs b/src/protocol/eval/executor.rs
index 950826a2f2cf5d4412098f768ba442675b0b27d7..2a77a1ebb0dcb357eb413cd626ea2b65a7abb639 100644
--- a/src/protocol/eval/executor.rs
+++ b/src/protocol/eval/executor.rs
@@ -27,7 +27,6 @@ pub(crate) enum ExprInstruction {
 #[derive(Debug, Clone)]
 pub(crate) struct Frame {
     pub(crate) definition: ProcedureDefinitionId,
-    pub(crate) monomorph_type_id: TypeId,
     pub(crate) monomorph_index: usize,
     pub(crate) position: StatementId,
     pub(crate) expr_stack: VecDeque<ExprInstruction>, // hack for expression evaluation, evaluated by popping from back
@@ -37,7 +36,7 @@ pub(crate) struct Frame {
 
 impl Frame {
     /// Creates a new execution frame. Does not modify the stack in any way.
-    pub fn new(heap: &Heap, definition_id: ProcedureDefinitionId, monomorph_type_id: TypeId, monomorph_index: u32) -> Self {
+    pub fn new(heap: &Heap, definition_id: ProcedureDefinitionId, _monomorph_type_id: TypeId, monomorph_index: u32) -> Self {
         let definition = &heap[definition_id];
         let outer_scope_id = definition.scope;
         let first_statement_id = definition.body;
@@ -62,7 +61,6 @@ impl Frame {
 
         Frame{
             definition: definition_id,
-            monomorph_type_id,
             monomorph_index: monomorph_index as usize,
             position: first_statement_id.upcast(),
             expr_stack: VecDeque::with_capacity(128),