diff --git a/tests/unit-tests/challenge-credential.t.cpp b/tests/unit-tests/challenge-credential.t.cpp
index 9c5ee14..efe956b 100644
--- a/tests/unit-tests/challenge-credential.t.cpp
+++ b/tests/unit-tests/challenge-credential.t.cpp
@@ -53,7 +53,7 @@
   auto identityA = addIdentity(Name("/example"));
   auto keyA = identityA.getDefaultKey();
   auto certA = key.getDefaultCertificate();
-  CaState state(Name("/example"), "123", RequestType::NEW, Status::BEFORE_CHALLENGE, certA, makeEmptyBlock(tlv::ContentType_Key));
+  CaState state(Name("/example"), "123", RequestType::NEW, Status::BEFORE_CHALLENGE, certA, makeEmptyBlock(ndn::tlv::ContentType_Key));
 
   // create requester's credential
   auto identityB = addIdentity(Name("/trust/cert"));