diff --git a/runtime/common/src/slots/migration.rs b/runtime/common/src/slots/migration.rs
deleted file mode 100644
index b59ab35d4c63..000000000000
--- a/runtime/common/src/slots/migration.rs
+++ /dev/null
@@ -1,96 +0,0 @@
-// Copyright 2017-2020 Parity Technologies (UK) Ltd.
-// This file is part of Polkadot.
-
-// Polkadot is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-
-// Polkadot is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License
-// along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
-
-use super::*;
-use crate::crowdloan;
-use sp_runtime::traits::AccountIdConversion;
-
-/// Migrations for using fund index to create fund accounts instead of para ID.
-pub mod slots_crowdloan_index_migration {
-	use super::*;
-
-	// The old way we generated fund accounts.
-	fn old_fund_account_id<T: Config + crowdloan::Config>(index: ParaId) -> T::AccountId {
-		<T as crowdloan::Config>::PalletId::get().into_sub_account(index)
-	}
-
-	pub fn pre_migrate<T: Config + crowdloan::Config>() -> Result<(), &'static str> {
-		for (para_id, leases) in Leases::<T>::iter() {
-			let old_fund_account = old_fund_account_id::<T>(para_id);
-
-			for maybe_deposit in leases.iter() {
-				if let Some((who, _amount)) = maybe_deposit {
-					if *who == old_fund_account {
-						let crowdloan =
-							crowdloan::Funds::<T>::get(para_id).ok_or("no crowdloan found")?;
-						log::info!(
-							target: "runtime",
-							"para_id={:?}, old_fund_account={:?}, fund_id={:?}, leases={:?}",
-							para_id, old_fund_account, crowdloan.fund_index, leases,
-						);
-						break
-					}
-				}
-			}
-		}
-
-		Ok(())
-	}
-
-	pub fn migrate<T: Config + crowdloan::Config>() -> frame_support::weights::Weight {
-		let mut weight = 0;
-
-		for (para_id, mut leases) in Leases::<T>::iter() {
-			weight = weight.saturating_add(T::DbWeight::get().reads(2));
-			// the para id must have a crowdloan
-			if let Some(fund) = crowdloan::Funds::<T>::get(para_id) {
-				let old_fund_account = old_fund_account_id::<T>(para_id);
-				let new_fund_account = crowdloan::Pallet::<T>::fund_account_id(fund.fund_index);
-
-				// look for places the old account is used, and replace with the new account.
-				for maybe_deposit in leases.iter_mut() {
-					if let Some((who, _amount)) = maybe_deposit {
-						if *who == old_fund_account {
-							*who = new_fund_account.clone();
-						}
-					}
-				}
-
-				// insert the changes.
-				weight = weight.saturating_add(T::DbWeight::get().writes(1));
-				Leases::<T>::insert(para_id, leases);
-			}
-		}
-
-		weight
-	}
-
-	pub fn post_migrate<T: Config + crowdloan::Config>() -> Result<(), &'static str> {
-		for (para_id, leases) in Leases::<T>::iter() {
-			let old_fund_account = old_fund_account_id::<T>(para_id);
-			log::info!(target: "runtime", "checking para_id: {:?}", para_id);
-			// check the old fund account doesn't exist anywhere.
-			for maybe_deposit in leases.iter() {
-				if let Some((who, _amount)) = maybe_deposit {
-					if *who == old_fund_account {
-						panic!("old fund account found after migration!");
-					}
-				}
-			}
-		}
-		Ok(())
-	}
-}