diff --git a/scripts/python-osm-ro.postinst b/scripts/python-osm-ro.postinst
index 32c8903..0f6e5a8 100755
--- a/scripts/python-osm-ro.postinst
+++ b/scripts/python-osm-ro.postinst
@@ -29,6 +29,7 @@
 pip2 install --upgrade pyvmomi
 pip2 install --upgrade pyang pyangbind
 pip2 install untangle
+pip2 install pyone
 pip2 install -e git+https://github.com/python-oca/python-oca#egg=oca
 pip2 install azure