diff -r 939d747055cd -r 8d2e55fac752 lemon/concepts/maps.h
--- a/lemon/concepts/maps.h	Wed Sep 12 17:51:20 2012 +0200
+++ b/lemon/concepts/maps.h	Thu Sep 13 11:52:50 2012 +0200
@@ -49,7 +49,7 @@
 
       /// Returns the value associated with the given key.
       Value operator[](const Key &) const {
-        return *static_cast<Value *>(0);
+        return *(static_cast<Value *>(0)+1);
       }
 
       template<typename _ReadMap>