tox 2.3.1 venv creates malformed pip for jython

When running tox 2.3.1 under both

CPython 2.7.11
CPython 3.5.1

the venv for Jython (installed via homebrew) doesn't get built and the resulting pip command has the entire #! bash script invocation line wrapped in double quotes.

 #!"/usr/bin/env /Users/seanj/w/projects/opensource-openmic-pdb/.tox/jython/bin/jython"

When this executed under the default bash shell.

bash: .tox/jython/bin/pip: "/usr/bin/env: bad interpreter: No such file or directory

When I remove the quotes, ./.tox/jython/bin/pip is able to execute properly.

The tox.ini is here https://bitbucket.org/s3anj/tpak/src/b21fcc36b735?at=default

Platform is OSX, with Python, PyPy and Jython installed via homebrew inside of virtualenvs. The pip list for the CPython env is

appnope (0.1.0)
decorator (4.0.7)
fancycompleter (0.4)
gnureadline (6.3.3)
ipython (4.1.1)
ipython-genutils (0.1.0)
ordereddict (1.1)
path.py (8.1.2)
pdbpp (0.8.3)
pexpect (4.0.1)
pickleshare (0.6)
pip (8.0.2)
pluggy (0.3.1)
ptyprocess (0.5.1)
py (1.4.31)
Pygments (2.1)
pyrepl (0.8.4)
pytest (2.8.7)
setuptools (20.0)
simplegeneric (0.8.1)
tox (2.3.1)
traitlets (4.1.0)
virtualenv (14.0.6)
wheel (0.29.0)
wmctrl (0.3)

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