diff --git a/lib/lattice/Lattice_reduction.h b/lib/lattice/Lattice_reduction.h
index 344e5da2..4599f2f9 100644
--- a/lib/lattice/Lattice_reduction.h
+++ b/lib/lattice/Lattice_reduction.h
@@ -152,7 +152,7 @@ template<class vobj> inline void sliceSum(const Lattice<vobj> &Data,std::vector<
   assert(grid!=NULL);
 
   // FIXME
-  std::cout<<GridLogMessage<<"WARNING ! SliceSum is unthreaded "<<grid->SumArraySize()<<" threads "<<std::endl;
+  // std::cout<<GridLogMessage<<"WARNING ! SliceSum is unthreaded "<<grid->SumArraySize()<<" threads "<<std::endl;
 
   const int    Nd = grid->_ndimension;
   const int Nsimd = grid->Nsimd();