diff --git a/libsrc/meshing/curvedelems.cpp b/libsrc/meshing/curvedelems.cpp
index 68ab1cff..e32a9eb6 100644
--- a/libsrc/meshing/curvedelems.cpp
+++ b/libsrc/meshing/curvedelems.cpp
@@ -560,10 +560,10 @@ namespace netgen
     order = 1;
 
     auto comm = mesh.GetCommunicator();
-    // #ifdef PARALLEL
+#ifdef PARALLEL
     enum { MPI_TAG_CURVE = MPI_TAG_MESH+20 };
     const ParallelMeshTopology & partop = mesh.GetParallelTopology ();
-    //#endif
+#endif
     int ntasks = comm.Size();
     bool working = (ntasks == 1) || (comm.Rank() > 0);