diff --git a/libsrc/interface/nginterface.cpp b/libsrc/interface/nginterface.cpp
index 8945c970..3db2fa1c 100644
--- a/libsrc/interface/nginterface.cpp
+++ b/libsrc/interface/nginterface.cpp
@@ -1606,7 +1606,10 @@ void Ng_GetEdge_Vertices (int ednr, int * vert)
 {
   const MeshTopology & topology = mesh->GetTopology();
   // topology.GetEdgeVertices (ednr, vert[0], vert[1]);
-  tie(vert[0], vert[1]) = topology.GetEdgeVertices(ednr-1);
+  // tie(vert[0], vert[1]) = topology.GetEdgeVertices(ednr-1);
+  auto [v1,v2] = topology.GetEdgeVertices(ednr-1);
+  vert[0] = v1-IndexBASE<PointIndex>()+1;
+  vert[1] = v2-IndexBASE<PointIndex>()+1;
 }