diff --git a/cumulus/polkadot-parachain/src/rpc.rs b/cumulus/polkadot-parachain/src/rpc.rs
index 283a73d931d7..feb2ae912fe0 100644
--- a/cumulus/polkadot-parachain/src/rpc.rs
+++ b/cumulus/polkadot-parachain/src/rpc.rs
@@ -41,6 +41,7 @@ pub(crate) trait BuildRpcExtensions<Client, Backend, Pool> {
 		client: Arc<Client>,
 		backend: Arc<Backend>,
 		pool: Arc<Pool>,
+		chain_spec: Box<dyn sc_chain_spec::ChainSpec>,
 	) -> sc_service::error::Result<RpcExtension>;
 }
 
@@ -60,6 +61,7 @@ where
 		_client: Arc<ParachainClient<RuntimeApi>>,
 		_backend: Arc<ParachainBackend>,
 		_pool: Arc<sc_transaction_pool::FullPool<Block, ParachainClient<RuntimeApi>>>,
+		_chain_spec: Box<dyn sc_chain_spec::ChainSpec>,
 	) -> sc_service::error::Result<RpcExtension> {
 		Ok(RpcExtension::new(()))
 	}
@@ -83,6 +85,7 @@ where
 		client: Arc<ParachainClient<RuntimeApi>>,
 		backend: Arc<ParachainBackend>,
 		pool: Arc<sc_transaction_pool::FullPool<Block, ParachainClient<RuntimeApi>>>,
+		chain_spec: Box<dyn sc_chain_spec::ChainSpec>,
 	) -> sc_service::error::Result<RpcExtension> {
 		let build = || -> Result<RpcExtension, Box<dyn std::error::Error + Send + Sync>> {
 			let mut module = RpcExtension::new(());
diff --git a/cumulus/polkadot-parachain/src/service.rs b/cumulus/polkadot-parachain/src/service.rs
index 80698a2d7115..03aa5ce8401d 100644
--- a/cumulus/polkadot-parachain/src/service.rs
+++ b/cumulus/polkadot-parachain/src/service.rs
@@ -255,6 +255,7 @@ pub(crate) trait NodeSpec {
 
 			let validator = parachain_config.role.is_authority();
 			let prometheus_registry = parachain_config.prometheus_registry().cloned();
+			let chain_spec = parachain_config.chain_spec.cloned();
 			let transaction_pool = params.transaction_pool.clone();
 			let import_queue_service = params.import_queue.service();
 			let net_config = FullNetworkConfiguration::<_, _, Net>::new(
@@ -281,12 +282,13 @@ pub(crate) trait NodeSpec {
 				let transaction_pool = transaction_pool.clone();
 				let backend_for_rpc = backend.clone();
 
-				Box::new(move |deny_unsafe, _| {
+				Box::new(move |deny_unsafe: sc_rpc::DenyUnsafe, _| {
 					Self::BuildRpcExtensions::build_rpc_extensions(
 						deny_unsafe,
 						client.clone(),
 						backend_for_rpc.clone(),
 						transaction_pool.clone(),
+						chain_spec,
 					)
 				})
 			};