diff --git a/model/sync-full-state.h b/model/sync-full-state.h
index cff1306..c39ec4f 100644
--- a/model/sync-full-state.h
+++ b/model/sync-full-state.h
@@ -37,6 +37,11 @@
 
 namespace Sync {
 
+class FullState;
+typedef boost::shared_ptr<FullState> FullStatePtr;
+typedef boost::shared_ptr<FullState> FullStateConstPtr;
+
+
 /**
  * \ingroup sync
  * @brief Cumulative SYNC state