PITTSBURGH -- Ansys reported fourth-quarter revenue fell1% to $251.6 million, as currency fluctuations lowered the results from what would have been a 4% gain.

Net income was down 2% in constant currency terms to $68 million. Operating cash flow increased 18% versus a year ago to $109.2 million.

Ansys CEO and president Jim Cashman said, “The fourth quarter presented us with a combination of both challenges and opportunities. Our earnings surpassed the high end of our expectations, while Q4 revenue came in at the low end of our expectations. Quarterly sales bookings showed strong improvement, exceeding the revenue growth rate, and contributed to a record total deferred revenue and backlog balance of $504 million."

The EDA software company's sales for the year grew 8% in constant currency terms and 1% otherwise to a record $942.8 million. Net income was $252.5 million, down 1% from 2014.

The company gave revenue guidance of $224 million to $232 million for the first quarter and $995 million to $1.03 billion for fiscal 2016.