diff --git a/src/serversdk/databasemanager.h b/src/serversdk/databasemanager.h
index 80a873a..831ef2a 100644
--- a/src/serversdk/databasemanager.h
+++ b/src/serversdk/databasemanager.h
@@ -45,7 +45,7 @@ private:
     void log(const QString &msg) const;
 
 signals:
-    void sqlError(const QSqlQuery &query);
+    void sqlError(const QSqlQuery &query) const;
 
 private:
     QString mConnectionName;