diff --git a/src/client-config.hpp b/src/client-config.hpp
index 0195c48..876535d 100644
--- a/src/client-config.hpp
+++ b/src/client-config.hpp
@@ -106,6 +106,9 @@
   static ClientCaItem
   extractCaItem(const JsonSection& configSection);
 
+  static ClientCaItem
+  extractCaItem(const Block& configSection);
+
 public:
   std::list<ClientCaItem> m_caItems;
   std::string m_localNdncertAnchor;