diff --git a/src/solver/hydro/daily/h2o_j_fonctions.h b/src/solver/hydro/daily/h2o_j_fonctions.h
index 2be835dc3e..5614e98d12 100644
--- a/src/solver/hydro/daily/h2o_j_fonctions.h
+++ b/src/solver/hydro/daily/h2o_j_fonctions.h
@@ -28,7 +28,7 @@
 #ifndef __SOLVER_H2O_J_FONCTIONS__
 #define __SOLVER_H2O_J_FONCTIONS__
 
-DONNEES_MENSUELLES H2O_J_Instanciation(void);
+DONNEES_MENSUELLES* H2O_J_Instanciation(void);
 
 void H2O_J_OptimiserUnMois(DONNEES_MENSUELLES*);
 void H2O_J_Free(DONNEES_MENSUELLES*);
diff --git a/src/solver/hydro/daily/h2o_j_instanciation.cpp b/src/solver/hydro/daily/h2o_j_instanciation.cpp
index fa0ecf5fa7..4824e7a545 100644
--- a/src/solver/hydro/daily/h2o_j_instanciation.cpp
+++ b/src/solver/hydro/daily/h2o_j_instanciation.cpp
@@ -28,11 +28,11 @@
 #include "h2o_j_donnees_mensuelles.h"
 #include "h2o_j_fonctions.h"
 
-DONNEES_MENSUELLES H2O_J_Instanciation(void)
+DONNEES_MENSUELLES* H2O_J_Instanciation(void)
 {
-    DONNEES_MENSUELLES DonneesMensuelles;
+    DONNEES_MENSUELLES* DonneesMensuelles = new DONNEES_MENSUELLES;;
 
-    PROBLEME_HYDRAULIQUE& ProblemeHydraulique = DonneesMensuelles.ProblemeHydraulique;
+    PROBLEME_HYDRAULIQUE& ProblemeHydraulique = DonneesMensuelles->ProblemeHydraulique;
 
     ProblemeHydraulique.NombreDeProblemes = 4;
 
@@ -44,10 +44,10 @@ DONNEES_MENSUELLES H2O_J_Instanciation(void)
     NbJoursDUnProbleme[2] = 30;
     NbJoursDUnProbleme[3] = 31;
 
-    DonneesMensuelles.TurbineMax.assign(NbJoursDUnProbleme[3], 0.);
-    DonneesMensuelles.TurbineMin.assign(NbJoursDUnProbleme[3], 0.);
-    DonneesMensuelles.TurbineCible.assign(NbJoursDUnProbleme[3], 0.);
-    DonneesMensuelles.Turbine.assign(NbJoursDUnProbleme[3], 0.);
+    DonneesMensuelles->TurbineMax.assign(NbJoursDUnProbleme[3], 0.);
+    DonneesMensuelles->TurbineMin.assign(NbJoursDUnProbleme[3], 0.);
+    DonneesMensuelles->TurbineCible.assign(NbJoursDUnProbleme[3], 0.);
+    DonneesMensuelles->Turbine.assign(NbJoursDUnProbleme[3], 0.);
 
     int NombreDeProblemes = ProblemeHydraulique.NombreDeProblemes;
 
diff --git a/src/solver/hydro/management/daily.cpp b/src/solver/hydro/management/daily.cpp
index 3650be78e1..25aa8116e4 100644
--- a/src/solver/hydro/management/daily.cpp
+++ b/src/solver/hydro/management/daily.cpp
@@ -391,7 +391,7 @@ inline void HydroManagement::prepareDailyOptimalGenerations(Solver::Variable::St
             uint firstDay = study.calendar.months[simulationMonth].daysYear.first;
             uint endDay = firstDay + daysPerMonth;
 
-            DONNEES_MENSUELLES problem = H2O_J_Instanciation();
+            DONNEES_MENSUELLES& problem = *H2O_J_Instanciation();
             H2O_J_AjouterBruitAuCout(problem);
             problem.NombreDeJoursDuMois = (int)daysPerMonth;
             problem.TurbineDuMois = data.MOG[realmonth];