Warning with 'cycle'

Hi, im using template tag 'cycle' (in Django version 1.7.1,) and is showing it in my terminal:

RemovedInDjango18Warning: 'The `cycle` template tag is changing to escape its arguments; the non-autoescaping version is deprecated. Load it from the `future` tag library to start using the new behavior.

In template:

<div class='{% cycle 'a1' 'a2' %}'></div>

Am I doing something wrong?

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