diff --git a/src/db/db/dbEdgeNeighborhood.h b/src/db/db/dbEdgeNeighborhood.h
index 88c8f6185..6f2913e94 100644
--- a/src/db/db/dbEdgeNeighborhood.h
+++ b/src/db/db/dbEdgeNeighborhood.h
@@ -58,7 +58,7 @@ public:
   /**
    *  @brief Event handler for each edge plus it's neighborhood
    */
-  void on_edge (const db::Layout *layout, const db::Cell *cell, const db::Edge &edge, const neighbors_type &neighbors);
+  virtual void on_edge (const db::Layout * /*layout*/, const db::Cell * /*cell*/, const db::Edge & /*edge*/, const neighbors_type & /*neighbors*/) { }
 };
 
 /**
diff --git a/src/db/db/gsiDeclDbEdgeNeighborhood.cc b/src/db/db/gsiDeclDbEdgeNeighborhood.cc
index 947b0322a..128721a00 100644
--- a/src/db/db/gsiDeclDbEdgeNeighborhood.cc
+++ b/src/db/db/gsiDeclDbEdgeNeighborhood.cc
@@ -99,7 +99,11 @@ private:
   tl::Mutex m_lock;
 };
 
-Class<gsi::EdgeNeighborhoodVisitorImpl> decl_EdgeNeighborhoodVisitorImpl ("db", "EdgeNeighborhoodVisitor",
+Class<db::EdgeNeighborhoodVisitor> decl_EdgeNeighborhoodVisitor ("db", "EdgeNeighborhoodVisitorBase",
+  "@hide"
+);
+
+Class<gsi::EdgeNeighborhoodVisitorImpl> decl_EdgeNeighborhoodVisitorImpl (decl_EdgeNeighborhoodVisitor, "db", "EdgeNeighborhoodVisitor",
   gsi::callback ("on_edge", &EdgeNeighborhoodVisitorImpl::issue_on_edge, &EdgeNeighborhoodVisitorImpl::f_on_edge, gsi::arg ("layout"), gsi::arg ("cell"), gsi::arg ("edge"), gsi::arg ("neighborhood"),
     "@brief Is called for each edge with the edge neighbors\n"
     "This method is called for every edge on the input region. It delivers the edge and the edge neighborhood. "