Index: trunk/FACT++/src/EventImp.h
===================================================================
--- trunk/FACT++/src/EventImp.h	(revision 18889)
+++ trunk/FACT++/src/EventImp.h	(revision 18890)
@@ -34,5 +34,5 @@
     // Configuration helper
     EventImp &operator()(const std::function<int(const EventImp &)> &func) { return AssignFunction(func); }
-    EventImp &operator()(const std::string str) { SetDescription(str); return *this; }
+    EventImp &operator()(const std::string &str) { SetDescription(str); return *this; }
     EventImp &operator()(const char *str) { SetDescription(str); return *this; }
     EventImp &operator()(int state) { fAllowedStates.push_back(state); return *this; }