diff --git a/include/lsWriteVisualizationMesh.hpp b/include/lsWriteVisualizationMesh.hpp
index 95828f0e..0378300a 100644
--- a/include/lsWriteVisualizationMesh.hpp
+++ b/include/lsWriteVisualizationMesh.hpp
@@ -603,7 +603,7 @@ template <class T, int D> class lsWriteVisualizationMesh {
            materialMeshes[materialMeshes.size() - 1 - i]->GetNumberOfCells();
            ++j) {
         materialNumberArray->InsertNextValue(
-            materialIds[materialMeshes.size() - 1 - i]);
+            materialIds[i]);
       }
       materialMeshes[materialMeshes.size() - 1 - i]->GetCellData()->SetScalars(
           materialNumberArray);