diff --git a/src/solver/utils/include/antares/solver/utils/ortools_wrapper.h b/src/solver/utils/include/antares/solver/utils/ortools_wrapper.h
index b7cc799db6..75a0b16bbd 100644
--- a/src/solver/utils/include/antares/solver/utils/ortools_wrapper.h
+++ b/src/solver/utils/include/antares/solver/utils/ortools_wrapper.h
@@ -47,6 +47,6 @@ void ORTOOLS_CorrigerLesBornes(MPSolver* ProbSpx,
                                const double* bMax,
                                const int* typeVar,
                                int nbVar);
-void ORTOOLS_LibererProbleme(MPSolver* ProbSpx);
+void ORTOOLS_LibererProbleme(MPSolver*& ProbSpx);
 
 #endif
diff --git a/src/solver/utils/ortools_utils.cpp b/src/solver/utils/ortools_utils.cpp
index 2c7b9ac39e..f4a2f16b5d 100644
--- a/src/solver/utils/ortools_utils.cpp
+++ b/src/solver/utils/ortools_utils.cpp
@@ -424,7 +424,7 @@ void ORTOOLS_CorrigerLesBornes(MPSolver* solver,
     }
 }
 
-void ORTOOLS_LibererProbleme(MPSolver* solver)
+void ORTOOLS_LibererProbleme(MPSolver*& solver)
 {
     delete solver;
     solver = nullptr;