diff --git a/tools/chunks/catchunks/discover-version.hpp b/tools/chunks/catchunks/discover-version.hpp
index 5049cc2..aaf409a 100644
--- a/tools/chunks/catchunks/discover-version.hpp
+++ b/tools/chunks/catchunks/discover-version.hpp
@@ -29,7 +29,6 @@
 #ifndef NDN_TOOLS_CHUNKS_CATCHUNKS_DISCOVER_VERSION_HPP
 #define NDN_TOOLS_CHUNKS_CATCHUNKS_DISCOVER_VERSION_HPP
 
-#include "core/common.hpp"
 #include "options.hpp"
 
 namespace ndn {
@@ -38,12 +37,12 @@
 class DataFetcher;
 
 /**
- * @brief Base class of services for discovering the latest Data version
+ * @brief Service for discovering the latest Data version.
  *
  * DiscoverVersion's user is notified once after identifying the latest retrievable version or
  * on failure to find any Data version.
  */
-class DiscoverVersion : virtual protected Options, noncopyable
+class DiscoverVersion
 {
 public: // signals
   /**
@@ -57,10 +56,7 @@
   signal::Signal<DiscoverVersion, std::string> onDiscoveryFailure;
 
 public:
-  /**
-   * @brief create a DiscoverVersion service
-   */
-  DiscoverVersion(const Name& prefix, Face& face, const Options& options);
+  DiscoverVersion(Face& face, const Name& prefix, const Options& options);
 
   /**
    * @brief identify the latest Data version published.
@@ -73,8 +69,9 @@
   handleData(const Interest& interest, const Data& data);
 
 private:
-  const Name m_prefix;
   Face& m_face;
+  const Name m_prefix;
+  const Options& m_options;
   shared_ptr<DataFetcher> m_fetcher;
 };