diff --git a/Cargo.lock b/Cargo.lock
index 58604b47a87da..3026b00114d1f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4720,6 +4720,7 @@ dependencies = [
  "pallet-balances",
  "pallet-contracts",
  "pallet-im-online",
+ "pallet-sudo",
  "pallet-timestamp",
  "pallet-transaction-payment",
  "pallet-treasury",
diff --git a/bin/node/executor/Cargo.toml b/bin/node/executor/Cargo.toml
index 5fbf59a74fdcd..6143ea3bd8c42 100644
--- a/bin/node/executor/Cargo.toml
+++ b/bin/node/executor/Cargo.toml
@@ -34,6 +34,7 @@ node-testing = { version = "3.0.0-dev", path = "../testing" }
 pallet-balances = { version = "4.0.0-dev", path = "../../../frame/balances" }
 pallet-contracts = { version = "4.0.0-dev", path = "../../../frame/contracts" }
 pallet-im-online = { version = "4.0.0-dev", path = "../../../frame/im-online" }
+pallet-sudo = { version = "4.0.0-dev", path = "../../../frame/sudo" }
 pallet-timestamp = { version = "4.0.0-dev", path = "../../../frame/timestamp" }
 pallet-treasury = { version = "4.0.0-dev", path = "../../../frame/treasury" }
 pallet-transaction-payment = { version = "4.0.0-dev", path = "../../../frame/transaction-payment" }
diff --git a/bin/node/executor/tests/fees.rs b/bin/node/executor/tests/fees.rs
index cf794bae1d307..e1550071d3006 100644
--- a/bin/node/executor/tests/fees.rs
+++ b/bin/node/executor/tests/fees.rs
@@ -58,8 +58,10 @@ fn fee_multiplier_increases_and_decreases_on_big_weight() {
 			},
 			CheckedExtrinsic {
 				signed: Some((charlie(), signed_extra(0, 0))),
-				function: Call::System(frame_system::Call::fill_block {
-					ratio: Perbill::from_percent(60),
+				function: Call::Sudo(pallet_sudo::Call::sudo {
+					call: Box::new(Call::System(frame_system::Call::fill_block {
+						ratio: Perbill::from_percent(60),
+					})),
 				}),
 			},
 		],
diff --git a/frame/system/src/lib.rs b/frame/system/src/lib.rs
index 370a802665918..3c6f514808b5d 100644
--- a/frame/system/src/lib.rs
+++ b/frame/system/src/lib.rs
@@ -197,6 +197,7 @@ impl<MaxNormal: Get<u32>, MaxOverflow: Get<u32>> ConsumerLimits for (MaxNormal,
 pub mod pallet {
 	use crate::{self as frame_system, pallet_prelude::*, *};
 	use frame_support::pallet_prelude::*;
+	use sp_runtime::DispatchErrorWithPostInfo;
 
 	/// System configuration trait. Implemented by runtime.
 	#[pallet::config]
@@ -371,8 +372,16 @@ pub mod pallet {
 		// that's not possible at present (since it's within the pallet macro).
 		#[pallet::weight(*_ratio * T::BlockWeights::get().max_block)]
 		pub fn fill_block(origin: OriginFor<T>, _ratio: Perbill) -> DispatchResultWithPostInfo {
-			ensure_root(origin)?;
-			Ok(().into())
+			match ensure_root(origin) {
+				Ok(_) => Ok(().into()),
+				Err(_) => {
+					// roughly same as a 4 byte remark since perbill is u32.
+					Err(DispatchErrorWithPostInfo {
+						post_info: Some(T::SystemWeightInfo::remark(4u32)).into(),
+						error: DispatchError::BadOrigin,
+					})
+				},
+			}
 		}
 
 		/// Make some on-chain remark.