diff --git a/src/challenge-module/challenge-credential.hpp b/src/challenge-module/challenge-credential.hpp
index 5d4a93c..bf53175 100644
--- a/src/challenge-module/challenge-credential.hpp
+++ b/src/challenge-module/challenge-credential.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 +62,9 @@
   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:
   void
   parseConfigFile();