diff --git a/src/solver/optimisation/constraints/NbDispUnitsMinBoundSinceMinUpTime.cpp b/src/solver/optimisation/constraints/NbDispUnitsMinBoundSinceMinUpTime.cpp
index a1a73ef2fa..bb298a3f8d 100644
--- a/src/solver/optimisation/constraints/NbDispUnitsMinBoundSinceMinUpTime.cpp
+++ b/src/solver/optimisation/constraints/NbDispUnitsMinBoundSinceMinUpTime.cpp
@@ -54,7 +54,7 @@ void NbDispUnitsMinBoundSinceMinUpTime::add(int pays, int index, int pdt)
         builder.greaterThan();
         if (builder.NumberOfVariables() > 1)
         {
-            data.CorrespondanceCntNativesCntOptim[pays]
+            data.CorrespondanceCntNativesCntOptim[pdt]
               .NumeroDeContrainteDesContraintesDeDureeMinDeMarche[cluster]
               = builder.data.nombreDeContraintes;