diff --git a/test/helpers/ReentrancyAttack.sol b/test/helpers/ReentrancyAttack.sol
index 14458144f..37b5cffd7 100644
--- a/test/helpers/ReentrancyAttack.sol
+++ b/test/helpers/ReentrancyAttack.sol
@@ -3,7 +3,7 @@ pragma solidity ^0.4.11;
 contract ReentrancyAttack {
 
   function callSender(bytes4 data) {
-    assert(msg.sender.call(data));
+    require(msg.sender.call(data));
   }
 
 }
diff --git a/test/helpers/ReentrancyMock.sol b/test/helpers/ReentrancyMock.sol
index 178b14cf1..63162fd92 100644
--- a/test/helpers/ReentrancyMock.sol
+++ b/test/helpers/ReentrancyMock.sol
@@ -27,7 +27,7 @@ contract ReentrancyMock is ReentrancyGuard {
     if(n > 0) {
       count();
       bool result = this.call(func, n - 1);
-      assert(result == true);
+      require(result == true);
     }
   }