diff --git a/libsrc/include/nginterface_v2.hpp b/libsrc/include/nginterface_v2.hpp
index cf6e4c6c..b1c8373a 100644
--- a/libsrc/include/nginterface_v2.hpp
+++ b/libsrc/include/nginterface_v2.hpp
@@ -240,7 +240,7 @@ namespace netgen
     
 
     template <int DIM>
-    Ng_Node<DIM> GetNode (int nr) const;
+    const Ng_Node<DIM> GetNode (int nr) const;
     
     
     template <int DIM>
diff --git a/libsrc/interface/nginterface_v2.cpp b/libsrc/interface/nginterface_v2.cpp
index ee146afe..d8556baa 100644
--- a/libsrc/interface/nginterface_v2.cpp
+++ b/libsrc/interface/nginterface_v2.cpp
@@ -612,7 +612,7 @@ namespace netgen
     return mesh->GetTopology().GetNFaces();
   }
 
-  template <> DLL_HEADER Ng_Node<0> Ngx_Mesh :: GetNode<0> (int vnr) const
+  template <> DLL_HEADER const Ng_Node<0> Ngx_Mesh :: GetNode<0> (int vnr) const
   {
     Ng_Node<0> node;
     vnr++;
@@ -646,14 +646,14 @@ namespace netgen
   }
 
   
-  template <> DLL_HEADER Ng_Node<1> Ngx_Mesh :: GetNode<1> (int nr) const
+  template <> DLL_HEADER const Ng_Node<1> Ngx_Mesh :: GetNode<1> (int nr) const
   {
     Ng_Node<1> node;
     node.vertices.ptr = mesh->GetTopology().GetEdgeVerticesPtr(nr);
     return node;
   }
 
-  template <> DLL_HEADER Ng_Node<2> Ngx_Mesh :: GetNode<2> (int nr) const
+  template <> DLL_HEADER const Ng_Node<2> Ngx_Mesh :: GetNode<2> (int nr) const
   {
     Ng_Node<2> node;
     node.vertices.ptr = mesh->GetTopology().GetFaceVerticesPtr(nr);