The Missouri legislature has approved a proposal that moves the date of a public vote on the state’s right-to-work law to the August 2018 ballot.

The proposal was approved 96-47 in the Missouri House on May 17. The Senate had already passed the measure. The legislative approval moves a statewide vote on whether to prevent the Missouri right-to-work law from taking effect from November to the Aug. 7 primary ballot.

If allowed to become effective, Missouri’s right-to-work law would prohibit employers from requiring employees to join a union or pay union dues as a condition of employment. The right-to-work law was passed in early 2017, but the law was prevented from taking effect when opponents collected enough petition signatures to force a referendum on the matter.