CR fix 3

Change-Id: If6802a52f48870a1fe3c42d57d7797a5f5248b26
diff --git a/tests/unit-tests/bench.t.cpp b/tests/unit-tests/bench.t.cpp
index 9fba0e8..0927e9c 100644
--- a/tests/unit-tests/bench.t.cpp
+++ b/tests/unit-tests/bench.t.cpp
@@ -144,7 +144,7 @@
       auto paramList = requester::Requester::selectOrContinueChallenge(state, "pin");
       auto request = ca.getCertificateRequest(*challengeInterest2);
       auto secret = request->m_challengeState->m_secrets.get(ChallengePin::PARAMETER_KEY_CODE, "");
-      std::get<1>(paramList[0]) = secret;
+      paramList.begin()->second = secret;
       challengeInterest3 = requester::Requester::genChallengeInterest(state, std::move(paramList));
       // std::cout << "CHALLENGE Interest Size: " << challengeInterest3->wireEncode().size() << std::endl;
     }