diff --git a/trunk/paradiseo-mo/src/moILS.h b/trunk/paradiseo-mo/src/moILS.h
index 11d5d5d9f..d8a4efd6f 100644
--- a/trunk/paradiseo-mo/src/moILS.h
+++ b/trunk/paradiseo-mo/src/moILS.h
@@ -186,6 +186,7 @@ class moILS:public moAlgo < typename M::EOType >
     while ( continu (_solution) )
       {
 	perturbation(_solution);
+	_solution.invalidate();
 	full_evaluation(_solution);
 
 	(*algorithm)(_solution);
diff --git a/trunk/paradiseo-mo/test/t-moILS.cpp b/trunk/paradiseo-mo/test/t-moILS.cpp
index 644a75222..bf8d75a87 100644
--- a/trunk/paradiseo-mo/test/t-moILS.cpp
+++ b/trunk/paradiseo-mo/test/t-moILS.cpp
@@ -131,6 +131,7 @@ public :
   void operator () (solution & _solution)
   {
     solution solution(_solution);
+    _solution.fitness(2);
   }
 } ;