diff --git a/src/configure b/src/configure
index 6394f987d241e27b191599a5bcd1ac642f6257c3..49916ee35c1e3fa956b21f543fdf5000b7781cd7 100755
--- a/src/configure
+++ b/src/configure
@@ -284,7 +284,7 @@ export ARMCI_SHR_BUF_METHOD=COPY
 'Linux belenos'*|'Linux taranis'*)
                 export     ARCH=${ARCH:-LXifort}
                 export  VER_MPI=${VER_MPI:-MPIAUTO}
-                export OPTLEVEL=${OPTLEVEL:-O3}
+                export OPTLEVEL=${OPTLEVEL:-O2}
                 export MVWORK=${MVWORK:-NO}
                 export VER_CDF=${VER_CDF:-CDFAUTO}
                 export NEED_TOOLS=YES
diff --git a/src/job_make_examples_BullX_belenos b/src/job_make_examples_BullX_belenos
index 857cbb403e54b879d95640bb31ec6d07335a036e..2086f3017e168dc4809281a5bb25d9d47e0086eb 100755
--- a/src/job_make_examples_BullX_belenos
+++ b/src/job_make_examples_BullX_belenos
@@ -20,7 +20,7 @@ hostname
 
 unset MAKEFLAGS
 
-. ../conf/profile_mesonh-LXifort-R8I4-MNH-V5-6-1-MPIAUTO-O3
+. ../conf/profile_mesonh-LXifort-R8I4-MNH-V5-6-1-MPIAUTO-O2
 export MONORUN="Mpirun -np 1 "
 export MPIRUN="Mpirun -np 2 "
 export POSTRUN="echo "
diff --git a/src/job_make_mesonh_BullX_belenos b/src/job_make_mesonh_BullX_belenos
index ce33a2d8067d13d0235d18e6663c2105bcdda331..5f8e7793096f59144740540b03825978c5ed9142 100755
--- a/src/job_make_mesonh_BullX_belenos
+++ b/src/job_make_mesonh_BullX_belenos
@@ -16,7 +16,7 @@ set -x
 # On va lancer la compilation dans le répertoire de lancement du job
 pwd
 
-. ../conf/profile_mesonh-LXifort-R8I4-MNH-V5-6-1-MPIAUTO-O3
+. ../conf/profile_mesonh-LXifort-R8I4-MNH-V5-6-1-MPIAUTO-O2
 
 time make -j 16
 time make -j 1 installmaster
diff --git a/src/job_make_mesonh_user_BullX_belenos b/src/job_make_mesonh_user_BullX_belenos
index 5f0622b2d6f640c3594e4e6d86cbacf9680b8095..97961346767835a7d59f67bbf814b2258c8c3adf 100755
--- a/src/job_make_mesonh_user_BullX_belenos
+++ b/src/job_make_mesonh_user_BullX_belenos
@@ -18,7 +18,7 @@ set -x
 # On va lancer la compilation dans le répertoire de lancement du job
 pwd
 
-. ../conf/profile_mesonh-LXifort-R8I4-MNH-V5-6-1-${VER_USER}-MPIAUTO-O3
+. ../conf/profile_mesonh-LXifort-R8I4-MNH-V5-6-1-${VER_USER}-MPIAUTO-O2
 
 time make user -j 2
 time make -j 1 installuser