diff --git a/src/challenge-module/challenge-pin.hpp b/src/challenge-module/challenge-pin.hpp
index 8eef944..7ae1d75 100644
--- a/src/challenge-module/challenge-pin.hpp
+++ b/src/challenge-module/challenge-pin.hpp
@@ -53,7 +53,7 @@
 
   // For CA
   void
-  handleChallengeRequest(const JsonSection& params, CertificateRequest& request) override;
+  handleChallengeRequest(const Block& params, CertificateRequest& request) override;
 
   // For Client
   JsonSection
@@ -62,6 +62,10 @@
   JsonSection
   genChallengeRequestJson(int status, const std::string& challengeStatus, const JsonSection& params) override;
 
+  Block
+  genChallengeRequestTLV(int status, const std::string& challengeStatus, const JsonSection& params) override;
+
+
 PUBLIC_WITH_TESTS_ELSE_PRIVATE:
   // challenge status
   static const std::string NEED_CODE;