diff --git a/src/requester.cpp b/src/requester.cpp
index 52c0014..8a8dc86 100644
--- a/src/requester.cpp
+++ b/src/requester.cpp
@@ -206,7 +206,7 @@
   // ECDH and HKDF
   auto sharedSecret = state.m_ecdh.deriveSecret(ecdhKey);
   hkdf(sharedSecret.data(), sharedSecret.size(),
-       salt.data(), salt.size(), state.m_aesKey, sizeof(state.m_aesKey));
+       salt.data(), salt.size(), state.m_aesKey.data(), state.m_aesKey.size());
 
   // update state
   return challenges;
@@ -243,7 +243,7 @@
   interest->setCanBePrefix(false);
 
   // encrypt the Interest parameters
-  auto paramBlock = encodeBlockWithAesGcm128(ndn::tlv::ApplicationParameters, state.m_aesKey,
+  auto paramBlock = encodeBlockWithAesGcm128(ndn::tlv::ApplicationParameters, state.m_aesKey.data(),
                                              challengeParams.value(), challengeParams.value_size(),
                                              state.m_requestId.data(),
                                              state.m_requestId.size(),