Raytheon Co. on Thursday lifted its 2015 sales forecast and expects its defense business to return to growth a year earlier than expected, boosted by sales of missile defense systems and a recent cybersecurity acquisition.

The Pentagon's fourth-largest supplier by revenue reported forecast-beating second-quarter profits, and although full-year earnings' guidance was narrowed following May's $1.6 billion deal to acquire control of Websense, said it was more optimistic about the deal's financial impact.

"It's not as dilutive as we thought," Chief Financial Officer Toby O'Brien said in an interview, with the unit reporting a loss of $1 million for the quarter.

The company trimmed its 2015 earnings guidance to a range of to $6.47 to $6.62 from $6.67 to $6.82 to reflect the Websense deal, ahead of analysts' expectations, and also boosted its share buyback plan.

Raytheon is a closely watched barometer of the industry's health because of its relatively large overseas exposure, a run of domestic contract wins and efforts to tap commercial as well as core defense markets. Most peers expect revenues to fall sequentially again this year, returning to growth in 2016.

The company raised its 2015 sales guidance by $400 million, with Austin, Texas-based Websense expected to add an extra $100 million and the unit that builds the Patriot missile-defense system boosting revenue by an additional $300 million.

Patriot sales helped lift revenues by 2.8% to $5.85 billion in the quarter, with $7.6 billion in orders boosting its book-to-bill ratio to 1.3.

Income from continuing operations rose to $504 million from $499 million, with per-share earnings climbing to $1.65 from $1.59, above analysts' expectations.

The Websense deal has made Raytheon an industry outlier with its push to marry prowess in government cybersecurity with increasing demand from the commercial sector. Peers such as Boeing Co. and General Dynamics Corp. are eschewing commercial business such as banks and utilities because of intense competition, and Lockheed Martin Corp. this week announced plans to sell or spin off its commercial cyber unit.

Write to Doug Cameron at doug.cameron@wsj.com

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