diff --git a/src/communication/sync-protocol-adapter.hpp b/src/communication/sync-protocol-adapter.hpp
index 363f02d..1d56b25 100644
--- a/src/communication/sync-protocol-adapter.hpp
+++ b/src/communication/sync-protocol-adapter.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2014-2018,  The University of Memphis,
+/*
+ * Copyright (c) 2014-2021,  The University of Memphis,
  *                           Regents of the University of California,
  *                           Arizona Board of Regents.
  *
@@ -17,7 +17,7 @@
  *
  * You should have received a copy of the GNU General Public License along with
  * NLSR, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
- **/
+ */
 
 #ifndef NLSR_SYNC_PROTOCOL_ADAPTER_HPP
 #define NLSR_SYNC_PROTOCOL_ADAPTER_HPP
@@ -25,7 +25,9 @@
 #include "conf-parameter.hpp"
 
 #include <ndn-cxx/face.hpp>
+#ifdef HAVE_CHRONOSYNC
 #include <ChronoSync/logic.hpp>
+#endif
 #include <PSync/full-producer.hpp>
 
 namespace nlsr {
@@ -37,7 +39,7 @@
 {
 public:
   SyncProtocolAdapter(ndn::Face& facePtr,
-                      int32_t syncProtocol,
+                      SyncProtocol syncProtocol,
                       const ndn::Name& syncPrefix,
                       const ndn::Name& userPrefix,
                       ndn::time::milliseconds syncInterestLifetime,
@@ -62,6 +64,7 @@
   publishUpdate(const ndn::Name& userPrefix, uint64_t seq);
 
 PUBLIC_WITH_TESTS_ELSE_PRIVATE:
+#ifdef HAVE_CHRONOSYNC
    /*! \brief Hook function to call whenever ChronoSync detects new data.
    *
    * This function packages the sync information into discrete updates
@@ -72,6 +75,7 @@
    */
   void
   onChronoSyncUpdate(const std::vector<chronosync::MissingDataInfo>& updates);
+#endif
 
    /*! \brief Hook function to call whenever PSync detects new data.
    *
@@ -85,9 +89,11 @@
   onPSyncUpdate(const std::vector<psync::MissingDataInfo>& updates);
 
 private:
-  int32_t m_syncProtocol;
+  SyncProtocol m_syncProtocol;
   SyncUpdateCallback m_syncUpdateCallback;
+#ifdef HAVE_CHRONOSYNC
   std::shared_ptr<chronosync::Logic> m_chronoSyncLogic;
+#endif
   std::shared_ptr<psync::FullProducer> m_psyncLogic;
 };