diff --git a/ParadisEO-GPU/tutoriel/QAP_CPU/src/QapIncrEval.h b/ParadisEO-GPU/tutoriel/QAP_CPU/src/QapIncrEval.h
index 0b689d01f..549623865 100644
--- a/ParadisEO-GPU/tutoriel/QAP_CPU/src/QapIncrEval.h
+++ b/ParadisEO-GPU/tutoriel/QAP_CPU/src/QapIncrEval.h
@@ -73,6 +73,7 @@ class QapIncrEval : public moEval<Neighbor>{
     unsigned i,j;
     _neighbor.getIndices(n,i,j);
     cost = _sol.fitness() +compute_delta(_sol,i,j);
+    _neighbor.fitness(cost);
   }
 
   /**