diff --git a/contracts/ERC20Mixer.sol b/contracts/ERC20Mixer.sol
index 92677f1..144c786 100644
--- a/contracts/ERC20Mixer.sol
+++ b/contracts/ERC20Mixer.sol
@@ -26,12 +26,12 @@ contract ERC20Mixer is Mixer {
     token = _token;
   }
 
-  function _processDeposit() internal nonReentrant {
+  function _processDeposit() internal {
     require(msg.value == 0, "ETH value is supposed to be 0 for ERC20 mixer");
     _safeErc20TransferFrom(msg.sender, address(this), denomination);
   }
 
-  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) internal nonReentrant {
+  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) internal {
     require(msg.value == _refund, "Incorrect refund amount received by the contract");
 
     _safeErc20Transfer(_recipient, denomination - _fee);
diff --git a/contracts/ETHMixer.sol b/contracts/ETHMixer.sol
index bc2859b..2996b5e 100644
--- a/contracts/ETHMixer.sol
+++ b/contracts/ETHMixer.sol
@@ -22,11 +22,11 @@ contract ETHMixer is Mixer {
   ) Mixer(_verifier, _denomination, _merkleTreeHeight, _operator) public {
   }
 
-  function _processDeposit() internal nonReentrant {
+  function _processDeposit() internal {
     require(msg.value == denomination, "Please send `mixDenomination` ETH along with transaction");
   }
 
-  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) internal nonReentrant {
+  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) internal {
     // sanity checks
     require(msg.value == 0, "Message value is supposed to be zero for ETH mixer");
     require(_refund == 0, "Refund value is supposed to be zero for ETH mixer");
diff --git a/contracts/Mixer.sol b/contracts/Mixer.sol
index 039de94..a17f827 100644
--- a/contracts/Mixer.sol
+++ b/contracts/Mixer.sol
@@ -59,7 +59,7 @@ contract Mixer is MerkleTreeWithHistory, ReentrancyGuard {
     @dev Deposit funds into mixer. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this mixer.
     @param _commitment the note commitment, which is PedersenHash(nullifier + secret)
   */
-  function deposit(bytes32 _commitment) external payable {
+  function deposit(bytes32 _commitment) external payable nonReentrant {
     require(!commitments[_commitment], "The commitment has been submitted");
 
     uint32 insertedIndex = _insert(_commitment);
@@ -80,7 +80,7 @@ contract Mixer is MerkleTreeWithHistory, ReentrancyGuard {
       - the recipient of funds
       - optional fee that goes to the transaction sender (usually a relay)
   */
-  function withdraw(bytes calldata _proof, bytes32 _root, bytes32 _nullifierHash, address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) external payable {
+  function withdraw(bytes calldata _proof, bytes32 _root, bytes32 _nullifierHash, address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) external payable nonReentrant {
     require(_fee <= denomination, "Fee exceeds transfer value");
     require(!nullifierHashes[_nullifierHash], "The note has been already spent");
     require(isKnownRoot(_root), "Cannot find your merkle root"); // Make sure to use a recent one