diff --git a/src/detail/challenge-encoder.cpp b/src/detail/challenge-encoder.cpp
index fed4110..33559c8 100644
--- a/src/detail/challenge-encoder.cpp
+++ b/src/detail/challenge-encoder.cpp
@@ -40,7 +40,7 @@
 }
 
 void
-ChallengeEncoder::decodeDataContent(const Block& data, requester::RequesterState& state)
+ChallengeEncoder::decodeDataContent(const Block& data, requester::RequestContext& state)
 {
   data.parse();
   state.m_status = static_cast<Status>(readNonNegativeInteger(data.get(tlv::Status)));
diff --git a/src/detail/challenge-encoder.hpp b/src/detail/challenge-encoder.hpp
index 541ad60..e499094 100644
--- a/src/detail/challenge-encoder.hpp
+++ b/src/detail/challenge-encoder.hpp
@@ -34,7 +34,7 @@
   encodeDataContent(const ca::RequestState& request);
 
   static void
-  decodeDataContent(const Block& data, requester::RequesterState& state);
+  decodeDataContent(const Block& data, requester::RequestContext& state);
 };
 
 } // namespace ndncert