diff --git a/o/Octopus/Octopus-7.1-intel-2017a-mpi.eb b/o/Octopus/Octopus-7.1-intel-2017a-mpi.eb
index c485703d..66733f91 100644
--- a/o/Octopus/Octopus-7.1-intel-2017a-mpi.eb
+++ b/o/Octopus/Octopus-7.1-intel-2017a-mpi.eb
@@ -33,7 +33,7 @@ dependencies = [
     ('GSL', '2.3'),
 ]
 
-configopts = 'FC="mpiifort" FCFLAGS="-O2-xHost"--disable-openmp --enable-mpi --enable-newuoa --disable-python --disable-gdlib '
+configopts = 'FC="mpiifort" FCFLAGS="-O2 -xHost" --disable-openmp --enable-mpi --enable-newuoa --disable-python --disable-gdlib '
 configopts += '--with-libxc-prefix=$EBROOTLIBXC --with-gsl-prefix=$EBROOTGSL '
 configopts += '--with-blas="-L$BLAS_LIB_DIR $LIBBLAS" '
 configopts += '--with-blacs="$MKLROOT/lib/intel64/libmkl_blacs_intelmpi_lp64.a" '