Attempt to fix problem reported by Arne in issue #28
Attempt to fix problem reported by Arne in issue #28

zasdfgbnm/qutip,zasdfgbnm/qutip,cgranade/qutip,qutip/qutip,anubhavvardhan/qutip,qutip/qutip,cgranade/qutip,anubhavvardhan/qutip