diff --git a/test/utils/ConditionalOrderSignature.sol b/test/utils/ConditionalOrderSignature.sol
index 174d4f2c..a7f8f330 100644
--- a/test/utils/ConditionalOrderSignature.sol
+++ b/test/utils/ConditionalOrderSignature.sol
@@ -39,7 +39,7 @@ contract ConditionalOrderSignature {
 
         // array of dynamic length bytes must be hashed separately
         // to create an array of fixed length bytes32 hashes
-        bytes32[] memory hashedConditions;
+        bytes32[] memory hashedConditions = new bytes32[](co.conditions.length);
         for (uint256 i = 0; i < co.conditions.length; i++) {
             hashedConditions[i] = keccak256(co.conditions[i]);
         }