diff --git a/relay/kusama/src/lib.rs b/relay/kusama/src/lib.rs
index 2ef1d724cb..eaa951b691 100644
--- a/relay/kusama/src/lib.rs
+++ b/relay/kusama/src/lib.rs
@@ -1834,7 +1834,7 @@ sp_api::impl_runtime_apis! {
 	}
 
 	#[api_version(7)]
-	impl primitives::runtime_api::ParachainHost<Block, Hash, BlockNumber> for Runtime {
+	impl primitives::runtime_api::ParachainHost<Block> for Runtime {
 		fn validators() -> Vec<ValidatorId> {
 			parachains_runtime_api_impl::validators::<Runtime>()
 		}
diff --git a/relay/polkadot/src/lib.rs b/relay/polkadot/src/lib.rs
index 81f852f945..2f03d9f9ca 100644
--- a/relay/polkadot/src/lib.rs
+++ b/relay/polkadot/src/lib.rs
@@ -1878,7 +1878,7 @@ sp_api::impl_runtime_apis! {
 		}
 	}
 
-	impl primitives::runtime_api::ParachainHost<Block, Hash, BlockNumber> for Runtime {
+	impl primitives::runtime_api::ParachainHost<Block> for Runtime {
 		fn validators() -> Vec<ValidatorId> {
 			parachains_runtime_api_impl::validators::<Runtime>()
 		}