diff --git a/mo/src/problems/permutation/moShiftNeighbor.h b/mo/src/problems/permutation/moShiftNeighbor.h
index e8884f687..87dfb9265 100644
--- a/mo/src/problems/permutation/moShiftNeighbor.h
+++ b/mo/src/problems/permutation/moShiftNeighbor.h
@@ -38,11 +38,11 @@
  * Other name : insertion operator
  */
 template <class EOT, class Fitness=typename EOT::Fitness>
-class moShiftNeighbor: public moBackableNeighbor<EOT, Fitness>, public moIndexNeighbor<EOT>
+class moShiftNeighbor: public moBackableNeighbor<EOT, Fitness>, public moIndexNeighbor<EOT, Fitness>
 {
 public:
 
-  using moBackableNeighbor<EOT>::fitness;
+  using moBackableNeighbor<EOT, Fitness>::fitness;
   using moIndexNeighbor<EOT, Fitness>::key;
   using moIndexNeighbor<EOT, Fitness>::index;
   
diff --git a/moeo/tutorial/CMakeLists.txt b/moeo/tutorial/CMakeLists.txt
index 45557fb6a..e18c0c2af 100644
--- a/moeo/tutorial/CMakeLists.txt
+++ b/moeo/tutorial/CMakeLists.txt
@@ -19,4 +19,4 @@ add_subdirectory(examples)
 add_subdirectory(Lesson1)
 add_subdirectory(Lesson2)
 add_subdirectory(Lesson3)
-#add_subdirectory(Lesson4)
+add_subdirectory(Lesson4)