diff --git a/contracts/utils/cryptography/MerkleProof.sol b/contracts/utils/cryptography/MerkleProof.sol
index dce05a0dc05..0745746f61b 100644
--- a/contracts/utils/cryptography/MerkleProof.sol
+++ b/contracts/utils/cryptography/MerkleProof.sol
@@ -50,7 +50,8 @@ library MerkleProof {
      */
     function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
         bytes32 computedHash = leaf;
-        for (uint256 i = 0; i < proof.length; i++) {
+        uint256 len = proof.length;
+        for (uint256 i = 0; i < len; i++) {
             computedHash = Hashes.commutativeKeccak256(computedHash, proof[i]);
         }
         return computedHash;
@@ -61,7 +62,8 @@ library MerkleProof {
      */
     function processProofCalldata(bytes32[] calldata proof, bytes32 leaf) internal pure returns (bytes32) {
         bytes32 computedHash = leaf;
-        for (uint256 i = 0; i < proof.length; i++) {
+        uint256 len = proof.length;
+        for (uint256 i = 0; i < len; i++) {
             computedHash = Hashes.commutativeKeccak256(computedHash, proof[i]);
         }
         return computedHash;