diff --git a/env.sh b/env.sh
index 98f1d24..aeb4a1f 100644
--- a/env.sh
+++ b/env.sh
@@ -26,4 +26,4 @@
 . ${VENVDIR}/bin/activate
 
 # add top-level voltha dir to pythonpath
-export PYTHONPATH=${VOLTHA_BASE}/${VENVDIR}/lib/python2.7/site-packages:${PYTHONPATH}:${VOLTHA_BASE}:${VOLTHA_BASE}/protos/third_party
+export PYTHONPATH=${VOLTHA_BASE}/${VENVDIR}/lib/python2.7/site-packages:${VOLTHA_BASE}/pyvoltha:${VOLTHA_BASE}/pyvoltha/protos/third_party