diff --git a/model/sync-full-state.h b/model/sync-full-state.h
index 9769878..2aac7b9 100644
--- a/model/sync-full-state.h
+++ b/model/sync-full-state.h
@@ -67,10 +67,10 @@
   getDigest ();
   
   // from State
-  virtual void
+  virtual bool
   update (NameInfoConstPtr info, const SeqNo &seq);
 
-  virtual void
+  virtual bool
   remove (NameInfoConstPtr info);
   
 private: