diff --git a/trunk/paradiseo-mo/src/neighborhood/moIndexNeighbor.h b/trunk/paradiseo-mo/src/neighborhood/moIndexNeighbor.h
index eabcf0de0..e4e7448bb 100644
--- a/trunk/paradiseo-mo/src/neighborhood/moIndexNeighbor.h
+++ b/trunk/paradiseo-mo/src/neighborhood/moIndexNeighbor.h
@@ -64,7 +64,8 @@ public:
      * Assignment operator
      * @param _source the source neighbor
      */
-    virtual moIndexNeighbor<EOT, Fitness> & operator=(const moIndexNeighbor<EOT, Fitness> & _source) {
+
+    moIndexNeighbor<EOT, Fitness> & operator=(const moIndexNeighbor<EOT, Fitness> & _source) {
         moNeighbor<EOT, Fitness>::operator=(_source);
         this->key = _source.key ;
         return *this ;
diff --git a/trunk/paradiseo-mo/src/neighborhood/moOrderNeighborhood.h b/trunk/paradiseo-mo/src/neighborhood/moOrderNeighborhood.h
index f27d5bda3..8b5e556e6 100644
--- a/trunk/paradiseo-mo/src/neighborhood/moOrderNeighborhood.h
+++ b/trunk/paradiseo-mo/src/neighborhood/moOrderNeighborhood.h
@@ -110,7 +110,7 @@ public:
 	/**
 	 * Setter the position in the Neighborhood
 	 */
-	unsigned int setPosition(unsigned int _currentIndex) {
+	void setPosition(unsigned int _currentIndex) {
 		 currentIndex=_currentIndex;
 	}