diff --git a/contracts/instances/ERC20TornadoCloneable.sol b/contracts/instances/ERC20TornadoCloneable.sol
index 20c609f..8947ffa 100644
--- a/contracts/instances/ERC20TornadoCloneable.sol
+++ b/contracts/instances/ERC20TornadoCloneable.sol
@@ -63,7 +63,7 @@ contract ERC20TornadoCloneable is ERC20Tornado {
     address _token,
     uint256 _denomination,
     uint32 _merkleTreeHeight
-  ) external {
+  ) public virtual {
     // Part of ERC20TornadoCloneable.sol, denomination and levels is obviously
     // in all older code set once and never changed again, as such, we can use
     // these for `initialize`. The question comes, why is it set to 1 above?
@@ -107,7 +107,7 @@ contract ERC20TornadoCloneable is ERC20Tornado {
      system which will require the relayers to have a wallet-like smart contract, because then
      frontends will be able to build proofs for it, and as such there will be no need for this bullshit.
    */
-  function checkInfrastructureIsDead() external {
+  function checkInfrastructureIsDead() public virtual {
     require(router != address(0), "infrastructure already dead");
 
     try
@@ -160,7 +160,7 @@ contract ERC20TornadoCloneable is ERC20Tornado {
     address payable _relayer,
     uint256 _fee,
     uint256 _refund
-  ) internal override {
+  ) internal virtual override {
     // This is the part which we don't check if infra is down
     if (router != address(0)) {
       require(msg.sender == router, "if infrastructure not dead, router must be caller");
diff --git a/contracts/instances/ETHTornadoCloneable.sol b/contracts/instances/ETHTornadoCloneable.sol
index b68cb2a..b69a609 100644
--- a/contracts/instances/ETHTornadoCloneable.sol
+++ b/contracts/instances/ETHTornadoCloneable.sol
@@ -28,7 +28,7 @@ contract ETHTornadoCloneable is ETHTornado {
    * @param _merkleTreeHeight The merkle tree height of the instance. Usually
      20.
    */
-  function initialize(uint256 _denomination, uint32 _merkleTreeHeight) external {
+  function initialize(uint256 _denomination, uint32 _merkleTreeHeight) public virtual {
     // Part of ERC20TornadoCloneable.sol, denomination and levels is obviously
     // in all older code set once and never changed again, as such, we can use
     // these for `initialize`. The question comes, why is it set to 1 above?