diff --git a/libsrc/meshing/paralleltop.cpp b/libsrc/meshing/paralleltop.cpp
index 6a5d562c..c410f425 100644
--- a/libsrc/meshing/paralleltop.cpp
+++ b/libsrc/meshing/paralleltop.cpp
@@ -698,6 +698,9 @@ namespace netgen
     // cout << "UpdateCoarseGrid - done" << endl;
     
     is_updated = true;
+
+    MPI_Group_free(&MPI_LocalGroup);
+    MPI_Comm_free(&MPI_LocalComm);
   }
 }