diff --git a/libsrc/interface/nginterface_v2.cpp b/libsrc/interface/nginterface_v2.cpp
index e5fb36ec..bb93df5d 100644
--- a/libsrc/interface/nginterface_v2.cpp
+++ b/libsrc/interface/nginterface_v2.cpp
@@ -62,7 +62,7 @@ namespace netgen
   }
 
   NgMPI_Comm Ngx_Mesh :: GetCommunicator() const
-  { return Valid() ? mesh->GetCommunicator() : NgMPI_Comm(MPI_COMM_NULL); }
+  { return Valid() ? mesh->GetCommunicator() : NgMPI_Comm{}; }
 
   void Ngx_Mesh :: SaveMesh (ostream & ost) const
   {
diff --git a/ng/ngpkg.cpp b/ng/ngpkg.cpp
index af9c1ea6..31d67cac 100644
--- a/ng/ngpkg.cpp
+++ b/ng/ngpkg.cpp
@@ -1217,7 +1217,7 @@ namespace netgen
 	mesh->SetMinimalH (mparam.minh);
       }
 
-#ifdef PARALLEL
+#ifdef PARALLELGL
     MyMPI_SendCmd ("bcastparthread");
     MyMPI_Bcast (mparam.parthread, MPI_COMM_WORLD);
 #endif
@@ -2703,7 +2703,7 @@ void PlayAnimFile(const char* name, int speed, int maxcnt)
     //cout << "stopped acis, outcome = " << res.ok() << endl;
 #endif
 
-#ifdef PARALLEL
+#ifdef PARALLELGL
     if (id == 0) MyMPI_SendCmd ("end");
     MPI_Finalize();
 #endif