Staffing firm and directly hired workers at the center of a National Labor Relations Board decision in California over who constitutes an employer voted in favor of joining a union, the Teamsters announced Friday.

The NLRB ruled last week that Browning-Ferris Industries of California was a joint employer of workers employed by staffing firm Leadpoint Business Services at BFI’s Milpitas, Calif., recycling site. In its decision, the board cited indirect and indirect control that BFI had over the Leadpoint workers. Although experts suspect the decision won’t have a big impact on unionization of temporary workers, it does represent an expansion of who is considered an employer.

Teamsters reported workers cast ballots in April 2014, but they remained uncounted for 16 months while the join-employment case made it through the NLRB, the union reported. The ballots were opened Sept. 4.

The Los Angeles Times reported the decision was 73-17.