Index: /trunk/FACT++/src/StateMachineImp.cc
===================================================================
--- /trunk/FACT++/src/StateMachineImp.cc	(revision 16870)
+++ /trunk/FACT++/src/StateMachineImp.cc	(revision 16871)
@@ -685,8 +685,5 @@
 {
     const StateNames::const_iterator i = fStateNames.find(state);
-
-    ostringstream s;
-    s << state;
-    return i==fStateNames.end() || i->second.first.empty() ? s.str() : i->second.first;
+    return i==fStateNames.end() || i->second.first.empty() ? to_string(state) : i->second.first;
 }