The U.S. economy added just 57,000 jobs in June, a worrying sign for labor market stability as wage growth tracked below inflation for a third consecutive month.

The economy added 57,000 jobs in June and the unemployment rate ticked down to 4.2 percent, according to a report released on Thursday.

The country’s unemployment rate dropped slightly to 4.2%, but the number of unemployed people changed little, according to the latest data, as 720,000 people left the labor force.