(AP) — A federal judge has ordered the Trump administration to reinstate roughly 300 federal workers it fired during the government shutdown, but she put the ruling on hold to allow the administration a chance to appeal.

U.S. District Judge Susan Illston in San Francisco ruled Wednesday the funding bill that ended the shutdown required the administration to reinstate employees it fired while the government was closed and refrain from firing any more workers until the end of January.

Labor unions said some employees were not being reinstated, and others were facing the threat of termination.

Illston, however, put her reinstatement order on hold until Tuesday. At a hearing on Wednesday, she said she wanted to avoid subjecting the affected employees to whiplash if an appeals court later put her ruling on hold and allowed the terminations.

Her ruling also indefinitely blocked the firing of another 400 or so workers. That part of her order went into effect immediately.