diff --git a/.dd4hep-ci.d/init_x86_64.sh b/.dd4hep-ci.d/init_x86_64.sh
index 658838dce9db5bce9213f185a34e4293a5900a78..62bcd467e29365f0e5119e5f0234a7a5f4e4fe94 100644
--- a/.dd4hep-ci.d/init_x86_64.sh
+++ b/.dd4hep-ci.d/init_x86_64.sh
@@ -61,6 +61,6 @@ source /cvmfs/sft.cern.ch/lcg/views/${LCG_RELEASE}/${BUILD_FLAVOUR}/setup.sh
 #--------------------------------------------------------------------------------
 export LCIO=/cvmfs/clicdp.cern.ch/software/LCIO/2.12.1/x86_64-${OS}-${COMPILER_VERSION}-LCG_96
 export LCIO_ROOT=${LCIO}
-export PYTHONPATH=${LCIO}/python
+export PYTHONPATH=${LCIO}/python:$PYTHONPATH
 export PATH=${LCIO}/bin:$PATH
 export LD_LIBRARY_PATH="$LCIO/lib:$LD_LIBRARY_PATH"