diff --git a/model/sync-app-socket-c.cc b/model/sync-app-socket-c.cc
index 0fc03e1..2445b8c 100644
--- a/model/sync-app-socket-c.cc
+++ b/model/sync-app-socket-c.cc
@@ -20,7 +20,7 @@
  *	   Alexander Afanasyev <alexander.afanasyev@ucla.edu>
  */
 
-#include "sync-app-socket-c.h"
+#include "sync-app-socket.h"
 using namespace std;
 using namespace Sync;
 
@@ -32,6 +32,9 @@
   }
 };
 
+struct SyncAppSocketStruct;
+
+extern "C"
 SyncAppSocketStruct *
 create_sync_app_socket(const char *prefix, void (*callback)(const char *, const char *)) 
 {
@@ -42,7 +45,7 @@
   return (SyncAppSocketStruct *) sock;
 }
 
-
+extern "C"
 void
 delete_sync_app_socket(SyncAppSocketStruct **sock) {
   SyncAppSocket *temp = *((SyncAppSocket **)sock);
@@ -51,14 +54,16 @@
 }
 
 // assume char *buf ends with '\0', or otherwise it's going to crash;
-// should fix this "feature" 
-bool
-sync_app_socket_publish(SyncAppSocketStruct *sock, const char *prefix, uint32_t session, const char *buf, int freshness) 
+// should fix this "feature"
+extern "C" 
+int
+sync_app_socket_publish(SyncAppSocketStruct *sock, const char *prefix, int session, const char *buf, int freshness) 
 {
   SyncAppSocket *temp = (SyncAppSocket *)sock;
   return temp->publish(prefix, session, buf, freshness);
 }
 
+extern "C"
 void
 sync_app_socket_remove(SyncAppSocketStruct *sock, const char *prefix) 
 {
diff --git a/model/sync-app-socket-c.h b/model/sync-app-socket-c.h
index 77afc79..6db2844 100644
--- a/model/sync-app-socket-c.h
+++ b/model/sync-app-socket-c.h
@@ -23,15 +23,17 @@
 #ifndef SYNC_APP_SOCKET_C_H
 #define SYNC_APP_SOCKET_C_H
 
-#include "sync-app-socket.h"
-
+#ifdef __cplusplus
 extern "C" {
-  typedef struct SyncAppSocketStruct;
+#endif
+  typedef struct SyncAppSocketStruct SyncAppSocketStruct;
 
   SyncAppSocketStruct *create_sync_app_socket(const char *prefix, void (*callback)(const char *, const char *));
   void delete_sync_app_socket(SyncAppSocketStruct **sock);
-  bool sync_app_socket_publish(SyncAppSocketStruct *sock, const char *prefix, uint32_t session, const char *buf, int freshness);
+  int sync_app_socket_publish(SyncAppSocketStruct *sock, const char *prefix, int session, const char *buf, int freshness);
   void sync_app_socket_remove(SyncAppSocketStruct *sock, const char *prefix);
+#ifdef __cplusplus
 }
+#endif
 
 #endif // SYNC_APP_SOCKET_C_H