diff --git a/solo-chains/runtime/dancelight/src/lib.rs b/solo-chains/runtime/dancelight/src/lib.rs
index c44ca85ad..b3f620c6e 100644
--- a/solo-chains/runtime/dancelight/src/lib.rs
+++ b/solo-chains/runtime/dancelight/src/lib.rs
@@ -1197,6 +1197,8 @@ impl pallet_mmr::Config for Runtime {
     type WeightInfo = ();
     type LeafData = pallet_beefy_mmr::Pallet<Runtime>;
     type BlockHashProvider = pallet_mmr::DefaultBlockHashProvider<Runtime>;
+    #[cfg(feature = "runtime-benchmarks")]
+    type BenchmarkHelper = ();
 }
 
 parameter_types! {