diff --git a/trunk/paradiseo-mo/src/explorer/moRandomSearchExplorer.h b/trunk/paradiseo-mo/src/explorer/moRandomSearchExplorer.h
index 1a5832e14..0b09da1d9 100644
--- a/trunk/paradiseo-mo/src/explorer/moRandomSearchExplorer.h
+++ b/trunk/paradiseo-mo/src/explorer/moRandomSearchExplorer.h
@@ -102,7 +102,8 @@ public:
         init(_solution);
 
         //eval the _solution moved with the neighbor and stock the result in the neighbor
-        fulleval(_solution);
+	if (_solution.invalid())
+	  fulleval(_solution);
     };
 
     /**
diff --git a/trunk/paradiseo-mo/src/mo.h b/trunk/paradiseo-mo/src/mo.h
index d3f3190cb..6b5a3abff 100755
--- a/trunk/paradiseo-mo/src/mo.h
+++ b/trunk/paradiseo-mo/src/mo.h
@@ -66,6 +66,7 @@
 #include <continuator/moBestSoFarStat.h>
 #include <continuator/moBestFitnessStat.h>
 #include <continuator/moUnsignedStat.h>
+#include <continuator/moValueStat.h>
 #include <continuator/moBooleanStat.h>
 #include <continuator/moCheckpoint.h>
 #include <continuator/moCombinedContinuator.h>