diff --git a/src/colnod/syncmanager.h b/src/colnod/syncmanager.h
index edfebca..9393b55 100644
--- a/src/colnod/syncmanager.h
+++ b/src/colnod/syncmanager.h
@@ -25,8 +25,8 @@ private:
 
 
 private:
-    Q_SLOT void saveColnodData(std::shared_ptr<Data> data);
-    Q_SLOT void saveDatabaseData(std::shared_ptr<Data> data);
+    Q_SLOT void saveColnodData(const std::shared_ptr<Data> &data);
+    Q_SLOT void saveDatabaseData(const std::shared_ptr<Data> &data);
     Q_SLOT void areDataReady();
 
 signals: