addStylesSet class applying to all styles

CKEDITOR.addStylesSet('my_styles',
[

// Block Styles
{ name: 'Paragraph', element: 'p' },
{ name: 'Pull Quote', element: 'div', attributes: { 'class' : 'pull_quote' } }

]);

I created two different styles. One being the typical paragraph, and the other being the Pull Quote wrapped in a div.

After using the Pull Quote style, when I create a new line and switch back to paragraph, the paragraph tag continues to inherit the class="pull_quote" every new paragraph.

I've tried

{ name: 'Paragraph', element: 'p' , attributes: { } }

No dice.