diff -r b6f76c95992e -r a93f1a27d831 lemon/suurballe.h
--- a/lemon/suurballe.h	Thu Mar 04 10:03:14 2010 +0100
+++ b/lemon/suurballe.h	Mon Mar 08 08:33:41 2010 +0100
@@ -403,6 +403,10 @@
     PredMap *_init_pred;
     bool _full_init;
 
+  protected:
+
+    Suurballe() {}
+
   public:
 
     /// \brief Constructor.