diff --git a/polkadot/runtime/src/utils.rs b/polkadot/runtime/src/utils.rs
index 4c16e215ba..1531590ff5 100644
--- a/polkadot/runtime/src/utils.rs
+++ b/polkadot/runtime/src/utils.rs
@@ -47,5 +47,5 @@ pub fn inherent_extrinsics(timestamp: ::primitives::Timestamp, parachain_heads:
 
 /// Checks an unchecked extrinsic for validity.
 pub fn check_extrinsic(xt: UncheckedExtrinsic) -> bool {
-	xt.check(Staking::lookup).is_ok()
+	xt.check_with(Staking::lookup).is_ok()
 }
diff --git a/polkadot/transaction-pool/src/lib.rs b/polkadot/transaction-pool/src/lib.rs
index 6e0ec39d77..a553afb94c 100644
--- a/polkadot/transaction-pool/src/lib.rs
+++ b/polkadot/transaction-pool/src/lib.rs
@@ -55,7 +55,7 @@ pub use extrinsic_pool::txpool::{Options, Status, LightStatus, VerifiedTransacti
 pub use error::{Error, ErrorKind, Result};
 
 /// Type alias for convenience.
-pub type CheckedExtrinsic = <UncheckedExtrinsic as Checkable>::Checked;
+pub type CheckedExtrinsic = <UncheckedExtrinsic as Checkable<fn(Address) -> std::result::Result<AccountId, &'static str>>>::Checked;
 
 /// A verified transaction which should be includable and non-inherent.
 #[derive(Clone, Debug)]
@@ -281,7 +281,7 @@ impl<'a, A> txpool::Verifier<UncheckedExtrinsic> for Verifier<'a, A> where
 		}
 
 		let (encoded_size, hash) = uxt.using_encoded(|e| (e.len(), BlakeTwo256::hash(e)));
-		let inner = match uxt.clone().check(|a| self.lookup(a)) {
+		let inner = match uxt.clone().check_with(|a| self.lookup(a)) {
 			Ok(xt) => Some(xt),
 			// keep the transaction around in the future pool and attempt to promote it later.
 			Err(Self::NO_ACCOUNT) => None,