Index: /trunk/MagicSoft/Mars/mhist/MHOnSubtraction.cc
===================================================================
--- /trunk/MagicSoft/Mars/mhist/MHOnSubtraction.cc	(revision 2173)
+++ /trunk/MagicSoft/Mars/mhist/MHOnSubtraction.cc	(revision 2174)
@@ -63,4 +63,5 @@
 ClassImp(MHOnSubtraction);
 
+using namespace std;
 
 // --------------------------------------------------------------------------