diff --git a/trunk/paradiseo-mo/src/problems/permutation/moSwapNeighbor.h b/trunk/paradiseo-mo/src/problems/permutation/moSwapNeighbor.h
index eb988cfed..1d1c7d9db 100644
--- a/trunk/paradiseo-mo/src/problems/permutation/moSwapNeighbor.h
+++ b/trunk/paradiseo-mo/src/problems/permutation/moSwapNeighbor.h
@@ -79,6 +79,17 @@ public:
 		_second = indices.second;
 	}
 
+	/**
+	 * @param _neighbor a neighbor
+	 * @return if _neighbor and this one are equals
+	 */
+	virtual bool equals(moSwapNeighbor<EOT>& _neighbor) {
+		unsigned f, s;
+		_neighbor.getIndices(f, s);
+		return ((indices.first == f) && (indices.second == s) || (indices.first
+				== s) && (indices.second == f));
+	}
+
 	/**
 	 * Print the Neighbor
 	 */