diff --git a/include/customizer/cell_customizer.hpp b/include/customizer/cell_customizer.hpp
index dfb927cdd..d92bd411e 100644
--- a/include/customizer/cell_customizer.hpp
+++ b/include/customizer/cell_customizer.hpp
@@ -117,16 +117,17 @@ class CellCustomizer
                    CellMetric &metric) const
     {
         // std::cerr << "Customizing cells\n";
-        // Heap heap_exemplar(graph.GetNumberOfNodes());
-        // HeapPtr heaps(heap_exemplar);
+        const auto number_of_nodes = graph.GetNumberOfNodes();
+        HeapPtr heaps([number_of_nodes]{
+            return Heap{number_of_nodes};
+        });
 
         for (std::size_t level = 1; level < partition.GetNumberOfLevels(); ++level)
         {
             tbb::parallel_for(tbb::blocked_range<std::size_t>(0, partition.GetNumberOfCells(level)),
                               [&](const tbb::blocked_range<std::size_t> &range)
                               {
-                                Heap heap{graph.GetNumberOfNodes()};
-                                //  auto &heap = heaps.local();
+                                  auto &heap = heaps.local();
                                   for (auto id = range.begin(), end = range.end(); id != end; ++id)
                                   {
                                       Customize(