diff --git a/lsmtool/operations/_grouper.cpp b/lsmtool/operations/_grouper.cpp
index a28bebd8b9dec0147a368f2cb2c45d8b21d7148c..997e597993225d5518d7d43a1c1d0ba955736dc4 100644
--- a/lsmtool/operations/_grouper.cpp
+++ b/lsmtool/operations/_grouper.cpp
@@ -94,7 +94,6 @@ void Grouper::run(){
   ctype newcoords = _coordinates;
 
   for (int it = 0; it < _numberOfIterations; ++it){
-   py::print("starting iteration ", it);
 #pragma omp parallel for
     for (unsigned n=0; n<_coordinates.size(); ++n){
       std::vector<unsigned> idx_neighbours = neighbourhood_points(_coordinates[n], _coordinates, _lookDistance);