diff -r b6f76c95992e -r a93f1a27d831 lemon/cost_scaling.h
--- a/lemon/cost_scaling.h	Thu Mar 04 10:03:14 2010 +0100
+++ b/lemon/cost_scaling.h	Mon Mar 08 08:33:41 2010 +0100
@@ -325,6 +325,10 @@
 
     /// @}
 
+  protected:
+
+    CostScaling() {}
+
   public:
 
     /// \brief Constructor.