[Python] Running Jupyter notebook in a virtualenv: installed sklearn module not available

I have installed a created a virtualenv machinelearn and installed a few python modules (pandas, scipy and sklearn) in that environment.

When I run jupyter notebook, I can import pandas and scipy in my notebooks - however, when I try to import sklearn, I get the following error message:

import sklearn

---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
<ipython-input-1-8fd979e02004> in <module>()
----> 1 import sklearn

ImportError: No module named 'sklearn'


I am able to import all modules, at the command line - so I know they have been successfully installed:

(machinelearn) me@yourbox:~/path/to/machinelearn$ python -c "import pandas, scipy, sklearn"
(machinelearn) me@yourbox:~/path/to/machinelearn$


How can I import sklearn in my jupyter notebook running in a virtualenv?

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