diff --git a/polkadot/runtime/kusama/src/lib.rs b/polkadot/runtime/kusama/src/lib.rs
index e399d7a0b3..7ef451e52e 100644
--- a/polkadot/runtime/kusama/src/lib.rs
+++ b/polkadot/runtime/kusama/src/lib.rs
@@ -2046,7 +2046,7 @@ mod tests_fess {
 #[cfg(test)]
 mod multiplier_tests {
 	use super::*;
-	use frame_support::{dispatch::GetDispatchInfo, traits::OnFinalize};
+	use frame_support::{dispatch::DispatchInfo, traits::OnFinalize};
 	use runtime_common::{MinimumMultiplier, TargetBlockFullness};
 	use separator::Separatable;
 	use sp_runtime::traits::Convert;
@@ -2088,17 +2088,8 @@ mod multiplier_tests {
 		let mut blocks = 0;
 		let mut fees_paid = 0;
 
-		let call = frame_system::Call::<Runtime>::fill_block {
-			ratio: Perbill::from_rational(
-				block_weight.ref_time(),
-				BlockWeights::get().get(DispatchClass::Normal).max_total.unwrap().ref_time(),
-			),
-		};
-		println!("calling {:?}", call);
-		let info = call.get_dispatch_info();
-		// convert to outer call.
-		let call = RuntimeCall::System(call);
-		let len = call.using_encoded(|e| e.len()) as u32;
+		frame_system::Pallet::<Runtime>::set_block_consumed_resources(Weight::MAX, 0);
+		let info = DispatchInfo { weight: Weight::MAX, ..Default::default() };
 
 		let mut t: sp_io::TestExternalities = frame_system::GenesisConfig::default()
 			.build_storage::<Runtime>()
@@ -2112,7 +2103,7 @@ mod multiplier_tests {
 		while multiplier <= Multiplier::from_u32(1) {
 			t.execute_with(|| {
 				// imagine this tx was called.
-				let fee = TransactionPayment::compute_fee(len, &info, 0);
+				let fee = TransactionPayment::compute_fee(0, &info, 0);
 				fees_paid += fee;
 
 				// this will update the multiplier.
diff --git a/polkadot/runtime/polkadot/src/lib.rs b/polkadot/runtime/polkadot/src/lib.rs
index 8beb551db3..25b142a13b 100644
--- a/polkadot/runtime/polkadot/src/lib.rs
+++ b/polkadot/runtime/polkadot/src/lib.rs
@@ -2299,7 +2299,7 @@ mod test {
 #[cfg(test)]
 mod multiplier_tests {
 	use super::*;
-	use frame_support::{dispatch::GetDispatchInfo, traits::OnFinalize};
+	use frame_support::{dispatch::DispatchInfo, traits::OnFinalize};
 	use runtime_common::{MinimumMultiplier, TargetBlockFullness};
 	use separator::Separatable;
 	use sp_runtime::traits::Convert;
@@ -2341,17 +2341,8 @@ mod multiplier_tests {
 		let mut blocks = 0;
 		let mut fees_paid = 0;
 
-		let call = frame_system::Call::<Runtime>::fill_block {
-			ratio: Perbill::from_rational(
-				block_weight.ref_time(),
-				BlockWeights::get().get(DispatchClass::Normal).max_total.unwrap().ref_time(),
-			),
-		};
-		println!("calling {:?}", call);
-		let info = call.get_dispatch_info();
-		// convert to outer call.
-		let call = RuntimeCall::System(call);
-		let len = call.using_encoded(|e| e.len()) as u32;
+		frame_system::Pallet::<Runtime>::set_block_consumed_resources(Weight::MAX, 0);
+		let info = DispatchInfo { weight: Weight::MAX, ..Default::default() };
 
 		let mut t: sp_io::TestExternalities = frame_system::GenesisConfig::default()
 			.build_storage::<Runtime>()
@@ -2365,7 +2356,7 @@ mod multiplier_tests {
 		while multiplier <= Multiplier::from_u32(1) {
 			t.execute_with(|| {
 				// imagine this tx was called.
-				let fee = TransactionPayment::compute_fee(len, &info, 0);
+				let fee = TransactionPayment::compute_fee(0, &info, 0);
 				fees_paid += fee;
 
 				// this will update the multiplier.