diff --git a/tests/ci/build_wheels.sh b/tests/ci/build_wheels.sh
index 3262893..a6150eb 100755
--- a/tests/ci/build_wheels.sh
+++ b/tests/ci/build_wheels.sh
@@ -1,57 +1,58 @@
 #!/usr/bin/env bash
 set -euxo pipefail
 
 cd $CI_PROJECT_DIR
 
 mkdir -p dist/wheels
 mkdir -p dist/wheelhouse
 
 # Checking all version of CPython
 for PYROOT in /opt/python/cp*; do
     MAJOR=$($PYROOT/bin/python --version 2>&1 | cut -d " " -f 2 | cut -d . -f 1)
     MINOR=$($PYROOT/bin/python --version 2>&1 | cut -d " " -f 2 | cut -d . -f 2)
     TAG=$(basename $PYROOT | cut -d "-" -f 1)
 
     # Skip Python 2
     [ $MAJOR -eq 2 ] && continue
     # Skip Beta Python 3 versions
     [ $MAJOR -eq 3 ] && [ $MINOR -ge 11 ] && continue
 
     # Compile
     scons -j4 \
           py_exec="$PYROOT/bin/python$MAJOR" \
           backend=cpp \
           fftw_threads=none \
           build_static_lib=True \
           use_mpi=False \
           strip_info=True \
           verbose=True \
           THRUST_ROOT=$THRUST_ROOT \
           FFTW_ROOT=$FFTW_ROOT \
+          CXXFLAGS="-fvisibility=hidden" \
         2>&1 | tee compile.log
 
     if [ $? -ne 0 ]; then
         cat config.log
     fi
 
     # Link fftw statically
     static_command=$(grep 'build-release/python/tamaas/_tamaas' compile.log \
                          | sed -e 's/lfftw3/l:libfftw3.a/' \
                          | tr -d '$()')
     $static_command
 
     # Create wheel
     pushd build-release/python
     $PYROOT/bin/python setup.py bdist_wheel              \
                         --python-tag $TAG                \
                         --plat-name manylinux2010_x86_64 \
                         -d ../../dist/wheels/
 
     popd
 
     rm -rf build-release/python
 done
 
 for wheel in dist/wheels/*.whl; do
     auditwheel repair $wheel -w dist/wheelhouse
 done