Our remarks today will include forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. We will make forward-looking statements about, among other matters, adjusted revenue, adjusted internal revenue growth, adjusted earnings per share, adjusted operating margin, free cash flow, free cash flow per share, sales pipelines, acquisitions and our strategic initiatives. Forward-looking statements may differ materially from actual results and are subject to a number of risks and uncertainties. Please refer to our earnings release, which can be found on our website at fiserv.com, for a discussion of these risk factors.
You should also refer to our earnings release for an explanation of the non-GAAP financial measures discussed on this conference call and for a reconciliation of those measures to the nearest applicable GAAP measures. These non-GAAP measures are indicators that management uses to provide additional meaningful comparisons between current results and prior-reported results and as a basis for planning and forecasting for future periods.
Also, please mark your calendars to attend our Annual Investor Day, which will be held in New York on Tuesday, October 9. We plan to send out invitations later this summer, and you may also follow up with our Investor Relations team for additional information. I will now turn the call over to Jeff.
Jeffery W. YabukiThanks, Peter, and good afternoon, everyone. We again generated strong earnings growth in the quarter, with adjusted EPS increasing 13% to $1.28 and is up 15% to $2.48 for the first half of the year. Adjusted revenue increased 3% in the quarter and 4% through June 30. Adjusted internal revenue growth was 1% in the quarter and is 2% year-to-date. Adjusted operating margin was 29.3% in the quarter, consistent with the prior year, and up 60 basis points sequentially. Adjusted operating margin has increased 20 basis points to 29% year-to-date, led by very strong performance in the Financial segment. Free cash flow increased 26% in the quarter to $115 million compared with the second quarter of 2011, driven by growth in operating earnings and favorable shifts in working capital. Year-to-date, free cash flow is down 11% to $298 million, primarily related to higher tax payments.