diff --git a/frame/system/benchmarking/src/lib.rs b/frame/system/benchmarking/src/lib.rs
index 60fc2737a4596..a2e3f7e2241ae 100644
--- a/frame/system/benchmarking/src/lib.rs
+++ b/frame/system/benchmarking/src/lib.rs
@@ -52,14 +52,7 @@ benchmarks! {
 		let runtime_blob = include_bytes!("../res/kitchensink_runtime.compact.compressed.wasm");
 	}: _(RawOrigin::Root, runtime_blob.to_vec())
 	verify {
-		assert_eq!(
-		System::<T>::events(),
-			vec![EventRecord {
-				phase: Phase::Initialization,
-				event: frame_system::Event::<T>::CodeUpdated.into(),
-				topics: vec![],
-			}],
-		);
+		System::<T>::assert_last_event(frame_system::Event::<T>::CodeUpdated.into());
 	}
 
 	#[extra]
diff --git a/frame/system/src/lib.rs b/frame/system/src/lib.rs
index 2894b5a237ee1..4ec3918ea8507 100644
--- a/frame/system/src/lib.rs
+++ b/frame/system/src/lib.rs
@@ -412,7 +412,8 @@ pub mod pallet {
 			ensure_root(origin)?;
 			Self::can_set_code(&code)?;
 			T::OnSetCode::set_code(code)?;
-			Ok(().into())
+			// consume the rest of the block to prevent further transactions
+			Ok(Some(T::BlockWeights::get().max_block).into())
 		}
 
 		/// Set the new runtime code without doing any checks of the given `code`.