diff --git a/trunk/paradiseo-mo/src/neighborhood/moNeighbor.h b/trunk/paradiseo-mo/src/neighborhood/moNeighbor.h
index 9d69bee1e..56bbf911b 100644
--- a/trunk/paradiseo-mo/src/neighborhood/moNeighbor.h
+++ b/trunk/paradiseo-mo/src/neighborhood/moNeighbor.h
@@ -108,7 +108,7 @@ public:
      * @param _neighbor a neighbor
      * @return if _neighbor and this one are equals
      */
-    virtual bool equals(moNeighbor<EOT>& _neighbor) {
+    virtual bool equals(moNeighbor<EOT,Fitness> & _neighbor) {
         return false;
     }
 
diff --git a/trunk/paradiseo-mo/src/problems/bitString/moBitsNeighbor.h b/trunk/paradiseo-mo/src/problems/bitString/moBitsNeighbor.h
index ef00db410..82c03e816 100644
--- a/trunk/paradiseo-mo/src/problems/bitString/moBitsNeighbor.h
+++ b/trunk/paradiseo-mo/src/problems/bitString/moBitsNeighbor.h
@@ -119,7 +119,7 @@ public:
    * @param _neighbor a neighbor
    * @return if _neighbor and this one are equals
    */
-  virtual bool equals(moBitsNeighbor<EOT>& _neighbor) {
+  virtual bool equals(moBitsNeighbor<EOT,Fitness> & _neighbor) {
     if (nBits != _neighbor.nBits)
       return false;
     else {
diff --git a/trunk/paradiseo-mo/src/problems/permutation/moSwapNeighbor.h b/trunk/paradiseo-mo/src/problems/permutation/moSwapNeighbor.h
index 1d1c7d9db..e940c836c 100644
--- a/trunk/paradiseo-mo/src/problems/permutation/moSwapNeighbor.h
+++ b/trunk/paradiseo-mo/src/problems/permutation/moSwapNeighbor.h
@@ -83,7 +83,7 @@ public:
 	 * @param _neighbor a neighbor
 	 * @return if _neighbor and this one are equals
 	 */
-	virtual bool equals(moSwapNeighbor<EOT>& _neighbor) {
+	virtual bool equals(moSwapNeighbor<EOT,Fitness>& _neighbor) {
 		unsigned f, s;
 		_neighbor.getIndices(f, s);
 		return ((indices.first == f) && (indices.second == s) || (indices.first