diff --git a/specfem3d/env/env_occigen b/specfem3d/env/env_occigen
index b280869f9e2f5a6e0fb3100e2393648751831466..d0fabae9f1f874bf7d0ea105a91fbe39471a69ec 100644
--- a/specfem3d/env/env_occigen
+++ b/specfem3d/env/env_occigen
@@ -2,7 +2,6 @@
 
 module purge
 module load intel/18.1 intelmpi/2018.1.163
-
 export machine=occigen
 export software=specfem3d_globe
 export version=31octobre
@@ -12,5 +11,5 @@ export install_dir=$SCRATCHDIR/benchmarks/$machine/$software/$version/${compiler
 export CC="mpiicc"
 export FC="mpiifort"
 export MPIFC=$FC
-export FCFLAGS=" -g -O3 -qopenmp -xhost -DUSE_FP32 -DOPT_STREAMS -fp-model fast=2 -traceback -mcmodel=large"
-export CFLAGS=" -g -O3  -xhost "
+export FCFLAGS="-O3 -qopenmp -xHost -ipo -mtune=core-avx2 -no-prec-div -no-prec-sqrt -fma -DUSE_FP32 -DOPT_STREAMS -fp-model fast=2 -mcmodel=large"
+export CFLAGS="-O3  -xHost -ipo -mtune=core-avx2 -no-prec-div -no-prec-sqrt -fma"