diff --git a/relay/kusama/src/lib.rs b/relay/kusama/src/lib.rs
index a1ca49541c..4d0e5aa557 100644
--- a/relay/kusama/src/lib.rs
+++ b/relay/kusama/src/lib.rs
@@ -383,6 +383,8 @@ 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 = ();
 }
 
 /// MMR helper types.
diff --git a/relay/polkadot/src/lib.rs b/relay/polkadot/src/lib.rs
index d2fe27a747..6f71c8d5bd 100644
--- a/relay/polkadot/src/lib.rs
+++ b/relay/polkadot/src/lib.rs
@@ -370,6 +370,8 @@ 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 = ();
 }
 
 /// MMR helper types.