diff --git a/crates/circuit/src/dag_circuit.rs b/crates/circuit/src/dag_circuit.rs
index 6607a65de853..7655dd7ca614 100644
--- a/crates/circuit/src/dag_circuit.rs
+++ b/crates/circuit/src/dag_circuit.rs
@@ -6242,10 +6242,9 @@ impl DAGCircuit {
         for instr in iter {
             let op_name = instr.op.name();
             let (all_cbits, vars): (Vec<Clbit>, Option<Vec<PyObject>>) = {
-                // Check if the clbits are already included
                 if self.may_have_additional_wires(py, &instr) {
                     let mut clbits: HashSet<Clbit> =
-                        HashSet::from_iter(self.cargs_cache.intern(instr.clbits).iter().copied());
+                        HashSet::from_iter(self.cargs_interner.get(instr.clbits).iter().copied());
                     let (additional_clbits, additional_vars) =
                         self.additional_wires(py, instr.op.view(), instr.condition())?;
                     for clbit in additional_clbits {
@@ -6253,7 +6252,7 @@ impl DAGCircuit {
                     }
                     (clbits.into_iter().collect(), Some(additional_vars))
                 } else {
-                    (self.cargs_cache.intern(instr.clbits).to_vec(), None)
+                    (self.cargs_interner.get(instr.clbits).to_vec(), None)
                 }
             };
 
@@ -6268,7 +6267,7 @@ impl DAGCircuit {
             new_nodes.push(new_node);
 
             // Check all the qubits in this instruction.
-            for qubit in self.qargs_cache.intern(qubits_id) {
+            for qubit in self.qargs_interner.get(qubits_id) {
                 // Retrieve each qubit's last node
                 let qubit_last_node = if let Some(node) = qubit_last_nodes.remove(qubit) {
                     node