diff --git a/polkadot/runtime/parachains/src/assigner_on_demand/benchmarking.rs b/polkadot/runtime/parachains/src/assigner_on_demand/benchmarking.rs
index 5a6060cd2b4e..e5bd7ef0f21b 100644
--- a/polkadot/runtime/parachains/src/assigner_on_demand/benchmarking.rs
+++ b/polkadot/runtime/parachains/src/assigner_on_demand/benchmarking.rs
@@ -43,7 +43,7 @@ where
 {
 	ParasShared::<T>::set_session_index(SESSION_INDEX);
 	let mut config = HostConfiguration::default();
-	config.coretime_cores = 1;
+	config.coretime_params.cores = 1;
 	ConfigurationPallet::<T>::force_set_active_config(config);
 	let mut parachains = ParachainsCache::new();
 	ParasPallet::<T>::initialize_para_now(
diff --git a/polkadot/runtime/parachains/src/coretime/migration.rs b/polkadot/runtime/parachains/src/coretime/migration.rs
index b89786bb1ca8..bf6cd804d29e 100644
--- a/polkadot/runtime/parachains/src/coretime/migration.rs
+++ b/polkadot/runtime/parachains/src/coretime/migration.rs
@@ -114,7 +114,7 @@ mod v_coretime {
 
 			let legacy_paras = paras::Parachains::<T>::get();
 			let config = <configuration::Pallet<T>>::config();
-			let total_core_count = config.coretime_cores + legacy_paras.len() as u32;
+			let total_core_count = config.coretime_params.cores + legacy_paras.len() as u32;
 
 			let dmp_queue_size =
 				crate::dmp::Pallet::<T>::dmq_contents(T::BrokerId::get().into()).len() as u32;