diff -r 0759d974de81 -r 4add05447ca0 lemon/bellman_ford.h
--- a/lemon/bellman_ford.h	Sun Jan 05 22:24:56 2014 +0100
+++ b/lemon/bellman_ford.h	Tue Apr 14 08:39:40 2015 +0200
@@ -701,8 +701,8 @@
     /// like an STL container (by having begin() and end())
     /// which you can use in range-based for loops, STL algorithms, etc.
     LemonRangeWrapper1<ActiveIt, BellmanFord>
-        activeNodes(const BellmanFord& algorithm) const {
-      return LemonRangeWrapper1<ActiveIt, BellmanFord>(algorithm);
+    activeNodes() const {
+      return LemonRangeWrapper1<ActiveIt, BellmanFord>(*this);
     }