diff --git a/halo2_proofs/src/plonk/circuit.rs b/halo2_proofs/src/plonk/circuit.rs
index a5736f28ca..b43c6af1fa 100644
--- a/halo2_proofs/src/plonk/circuit.rs
+++ b/halo2_proofs/src/plonk/circuit.rs
@@ -1622,7 +1622,11 @@ impl<'a, F: Field> std::fmt::Debug for PinnedConstraintSystem<'a, F> {
             .field("instance_queries", self.instance_queries)
             .field("fixed_queries", self.fixed_queries)
             .field("permutation", self.permutation)
-            .field("lookups", self.lookups)
+            .field("lookups", self.lookups);
+        if !self.shuffles.is_empty() {
+            debug_struct.field("shuffles", self.shuffles);
+        }
+        debug_struct
             .field("constants", self.constants)
             .field("minimum_degree", self.minimum_degree);
         debug_struct.finish()