diff --git a/crates/circuit/src/dag_circuit.rs b/crates/circuit/src/dag_circuit.rs
index a27927eea8f8..6a80ddabd378 100644
--- a/crates/circuit/src/dag_circuit.rs
+++ b/crates/circuit/src/dag_circuit.rs
@@ -6203,8 +6203,8 @@ impl DAGCircuit {
             dag: StableDiGraph::with_capacity(num_nodes, num_edges),
             qregs: PyDict::new_bound(py).unbind(),
             cregs: PyDict::new_bound(py).unbind(),
-            qargs_cache: IndexedInterner::with_capacity(num_qubits),
-            cargs_cache: IndexedInterner::with_capacity(num_clbits),
+            qargs_interner: Interner::with_capacity(num_qubits),
+            cargs_interner: Interner::with_capacity(num_clbits),
             qubits: BitData::with_capacity(py, "qubits".to_string(), num_qubits),
             clbits: BitData::with_capacity(py, "clbits".to_string(), num_clbits),
             global_phase: Param::Float(0.),
diff --git a/crates/circuit/src/interner.rs b/crates/circuit/src/interner.rs
index 69a459fe7f95..1ad50b5150fe 100644
--- a/crates/circuit/src/interner.rs
+++ b/crates/circuit/src/interner.rs
@@ -99,10 +99,10 @@ where
     }
 
     pub fn with_capacity(capacity: usize) -> Self {
-        Self {
-            entries: Vec::with_capacity(capacity),
-            index_lookup: HashMap::with_capacity(capacity),
-        }
+        Self(IndexSet::with_capacity_and_hasher(
+            capacity,
+            ::ahash::RandomState::new(),
+        ))
     }
 }