diff --git a/model/sync-app-socket-c.cc b/model/sync-app-socket-c.cc
index 2445b8c..1233ec9 100644
--- a/model/sync-app-socket-c.cc
+++ b/model/sync-app-socket-c.cc
@@ -25,8 +25,11 @@
 using namespace Sync;
 
 class CallbackHolder{
-public:
+private:
   void (*m_callback)(const char *, const char *);
+
+public:
+  CallbackHolder(void (*callback)(const char*, const char*)):m_callback(callback){};
   void callbackWrapper(string name, string data) {
     m_callback(name.c_str(), data.c_str());
   }
@@ -38,8 +41,7 @@
 SyncAppSocketStruct *
 create_sync_app_socket(const char *prefix, void (*callback)(const char *, const char *)) 
 {
-  CallbackHolder holder;
-  holder.m_callback = callback;
+  CallbackHolder holder(callback);
   boost::function<void (string, string)> cb = bind(&CallbackHolder::callbackWrapper, &holder, _1, _2);
   SyncAppSocket *sock = new SyncAppSocket(prefix, cb);
   return (SyncAppSocketStruct *) sock;
diff --git a/model/sync-logic.cc b/model/sync-logic.cc
index d51a3a6..43fee90 100644
--- a/model/sync-logic.cc
+++ b/model/sync-logic.cc
@@ -221,7 +221,7 @@
               if (inserted || updated)
                 {
                   diffLog->update (info, seq);
-                  m_onUpdate (info->toString (), seq.getSeq(), oldSeq);
+                  m_onUpdate (info->toString (), seq, oldSeq);
                 }
             }
         }
@@ -247,7 +247,7 @@
                   if (inserted || updated)
                     {
                       diffLog->update (info, seq);
-                      m_onUpdate (info->toString (), seq.getSeq(), oldSeq);
+                      m_onUpdate (info->toString (), seq, oldSeq);
                     }
                 }
               else if (diffLeaf->getOperation() == REMOVE)
diff --git a/test/test_ccnx_wrapper.cc b/test/test_ccnx_wrapper.cc
index ad69262..f88ee5b 100644
--- a/test/test_ccnx_wrapper.cc
+++ b/test/test_ccnx_wrapper.cc
@@ -65,7 +65,7 @@
   hb.sendInterest(interest, memberFunc);
 
   // give time for ccnd to react
-  // sleep(1);
+  sleep(1);
   this_thread::sleep (posix_time::milliseconds (5));
   BOOST_CHECK_EQUAL(echoStr, interest);
 
diff --git a/wscript b/wscript
index ba0a706..6a0a629 100644
--- a/wscript
+++ b/wscript
@@ -14,6 +14,7 @@
 
 def configure(conf):
     conf.load("compiler_cxx")
+    conf.env.append_value('CXXFLAGS', ['-O0', '-g3'])
 
     if not conf.check_cfg(package='openssl', args=['--cflags', '--libs'], uselib_store='SSL', mandatory=False):
       libcrypto = conf.check_cc(lib='crypto',