diff --git a/halo2_proofs/examples/circuit-layout.rs b/halo2_proofs/examples/circuit-layout.rs
index feaaaf4a..921d9629 100644
--- a/halo2_proofs/examples/circuit-layout.rs
+++ b/halo2_proofs/examples/circuit-layout.rs
@@ -215,7 +215,7 @@ impl<F: FieldExt> Circuit<F> for MyCircuit<F> {
          *   ...       ...    ...  0
          * ]
          */
-        meta.lookup(|meta| {
+        meta.lookup("lookup", |meta| {
             let a_ = meta.query_any(a, Rotation::cur());
             vec![(a_, sl)]
         });