diff --git a/NonLinearEVP/NonLinearEVP.pro b/NonLinearEVP/NonLinearEVP.pro
index fc8ac7652a477abf1909b0c706b7f07108c20205..d2aae8fa5607a5d625272802800a52cc5ae486c6 100644
--- a/NonLinearEVP/NonLinearEVP.pro
+++ b/NonLinearEVP/NonLinearEVP.pro
@@ -500,8 +500,8 @@ slepc_options_nep_rat = Sprintf(" -nep_max_it 1000 -nep_type nleigs -nep_nleigs_
 // slepc_options_nep_rat = Sprintf(" -nep_max_it 1000 -nep_type nleigs -nep_rational        -nep_target_magnitude -nep_tol %.10f ",eig_tol);
 
 // // Warning petsc > 3.9 st_pc_factor_mat_solver_package => st_pc_factor_mat_solver_type
-slepc_options_st  = "-solve -st_type  sinvert -st_ksp_type preonly -st_pc_type lu -st_pc_factor_mat_solver_package mumps -petsc_prealloc 200 -pos";
-// slepc_options_st  = "-solve -st_type  sinvert -st_ksp_type preonly -st_pc_type lu -st_pc_factor_mat_solver_type mumps -petsc_prealloc 200 -pos";
+// slepc_options_st  = "-solve -st_type  sinvert -st_ksp_type preonly -st_pc_type lu -st_pc_factor_mat_solver_package mumps -petsc_prealloc 200 -pos";
+slepc_options_st  = "-solve -st_type  sinvert -st_ksp_type preonly -st_pc_type lu -st_pc_factor_mat_solver_type mumps -petsc_prealloc 200 -pos";
 
 slepc_options_pep = Sprintf(" -pep_max_it 400 -pep_target_magnitude -pep_tol %.10f ",eig_tol);