diff --git a/.ci/bb/levante-dkrz/test.icon-pio.intel-classic b/.ci/bb/levante-dkrz/test.icon-pio.intel-classic
index b64f626d5b216c2fe62015c6e8c07fde322a7c25..b13f3ff34b858ddd801074994e1fd6812c1f6e9d 100755
--- a/.ci/bb/levante-dkrz/test.icon-pio.intel-classic
+++ b/.ci/bb/levante-dkrz/test.icon-pio.intel-classic
@@ -9,6 +9,12 @@ top_srcdir=$(cd "${script_dir}/../../.."; pwd)
 . "${script_dir}/utils.sh"
 init_intelclassic202150
 
+# The following compiler flags are used by the respective ICON configure
+# wrapper. They are not set into stone and can be changed if needed. It is just
+# important to keep them the same as in the wrapper.
+CFLAGS='-g -gdwarf-4 -qno-opt-dynamic-align -O3 -ftz'
+FCFLAGS='-g -gdwarf-4 -pc64 -fp-model source -march=native -O2 -assume realloc_lhs -ftz'
+
 # Make sure that the libtool script has a chance to erroneously link to the
 # shared versions of YAXT and PPM:
 for file in \
@@ -92,6 +98,7 @@ test -f "${top_srcdir}/configure" || "${top_srcdir}/autogen.sh"
 --without-grib_api \
 --without-szlib \
 --without-threads \
+AR="${AR}" \
 BUILD_CC= \
 BUILD_CFLAGS= \
 BUILD_CXX= \
@@ -103,12 +110,12 @@ BUILD_LIBS= \
 BUILD_MPI_C_LIB= \
 BUILD_MPI_FC_LIB= \
 CC="${MPICC}" \
-CFLAGS='-no-prec-sqrt -no-prec-div -fast-transcendentals -m64 -march=core-avx2 -mtune=core-avx2 -no-fma -g -gdwarf-4 -ip -pc64 -std=gnu99 -qno-opt-dynamic-align -O2 -ftz' \
+CFLAGS="${CFLAGS}" \
 CPPFLAGS="-I${NETCDF_ROOT}/include -I${ECCODES_ROOT}/include" \
 CXX=no \
 F77=no \
 FC="${MPIFC}" \
-FCFLAGS="-gdwarf-4 -g -pc64 -fp-model source" \
+FCFLAGS="${FCFLAGS}" \
 LDFLAGS="${LDFLAGS} -L${NETCDF_ROOT}/lib -L${ECCODES_ROOT}/lib64" \
 LIBS='-Wl,--as-needed -lnetcdf -leccodes' \
 MPIROOT= \
diff --git a/.ci/bb/levante-dkrz/test.icon.gcc b/.ci/bb/levante-dkrz/test.icon.gcc
index 4fd88e6181814bbadbfb1ac475630de3e05e742b..ad795369c1a480951a394e25cb7310474c1bd76a 100755
--- a/.ci/bb/levante-dkrz/test.icon.gcc
+++ b/.ci/bb/levante-dkrz/test.icon.gcc
@@ -8,6 +8,12 @@ top_srcdir=$(cd "${script_dir}/../../.."; pwd)
 . "${script_dir}/utils.sh"
 init_gcc1120
 
+# The following compiler flags are used by the respective ICON configure
+# wrapper. They are not set into stone and can be changed if needed. It is just
+# important to keep them the same as in the wrapper.
+CFLAGS='-g -gdwarf-4 -march=native -mpc64 -O2'
+FCFLAGS='-fmodule-private -fimplicit-none -fmax-identifier-length=63 -Wall -Wcharacter-truncation -Wconversion -Wunderflow -Wunused-parameter -Wno-surprising -fall-intrinsics -g -march=native -mpc64 -fbacktrace -fbounds-check -fstack-protector-all -finit-real=nan -finit-integer=-2147483648 -finit-character=127 -O2 -std=f2008'
+
 test -f "${top_srcdir}/configure" || "${top_srcdir}/autogen.sh"
 
 "${top_srcdir}/configure" \
@@ -40,12 +46,12 @@ BUILD_LIBS= \
 BUILD_MPI_C_LIB= \
 BUILD_MPI_FC_LIB= \
 CC="${MPICC}" \
-CFLAGS='-g -march=native -mpc64 -O2' \
+CFLAGS="${CFLAGS}" \
 CPPFLAGS="-I${NETCDF_ROOT}/include -I${ECCODES_ROOT}/include" \
 CXX=no \
 F77=no \
 FC="${MPIFC}" \
-FCFLAGS='-std=f2008 -fmodule-private -fimplicit-none -fmax-identifier-length=63 -Wall -Wcharacter-truncation -Wconversion -Wunderflow -Wunused-parameter -Wno-surprising -fall-intrinsics -g -march=native -mpc64' \
+FCFLAGS="${FCFLAGS}" \
 LDFLAGS="-L${NETCDF_ROOT}/lib -L${ECCODES_ROOT}/lib64" \
 LIBS='-leccodes -lnetcdf' \
 MPIROOT= \
diff --git a/.ci/bb/levante-dkrz/utils.sh b/.ci/bb/levante-dkrz/utils.sh
index da6c106252aa31cfe9b84fa24c8063ef6bab931f..eb379b7bdb4a74f2ceb1d1f8e28c38d02fa05e71 100644
--- a/.ci/bb/levante-dkrz/utils.sh
+++ b/.ci/bb/levante-dkrz/utils.sh
@@ -134,6 +134,7 @@ init_intelclassic202150 ()
   # intel-oneapi-compilers/2022.0.1-gcc-11.2.0:
   switch_for_module intel-oneapi-compilers/2022.0.1-gcc-11.2.0 openmpi/4.1.2-intel-2021.5.0
 
+  AR=xiar
   CC=icc
   CXX=icpc
   FC=ifort