diff --git a/include/multigrid_pclomp/multigrid_ndt_omp.h b/include/multigrid_pclomp/multigrid_ndt_omp.h
index 5df1e4dd..30087c66 100644
--- a/include/multigrid_pclomp/multigrid_ndt_omp.h
+++ b/include/multigrid_pclomp/multigrid_ndt_omp.h
@@ -121,6 +121,8 @@ class MultiGridNormalDistributionsTransform : public pcl::Registration<PointSour
 
   void setNumThreads(int n) {
     num_threads_ = n;
+
+    target_cells_.setThreadNum(num_threads_);
   }
 
   inline int getNumThreads() const {