Sales of previously owned houses unexpectedly dropped in June, hurt by a lack of supply and rising mortgage rates that will slow the rebound in the U.S. real-estate market.

Purchases fell 1.2 percent to a 5.08 million annualized rate, the National Association of Realtors reported Monday in Washington. The median forecast of 79 economists surveyed by Bloomberg called for a 5.26 million pace. The pace of the demand was the second strongest since November 2009 following May’s downwardly revised 5.14 million rate.