It's not known yet exactly how many Michigan election precincts ran short of ballots during Tuesday's primary.
Secretary of State spokesman Fred Woodhams thinks it's a small number.
"Michigan has 4,800 precincts," Woodhams said. "At this point we're aware of a dozen or so precincts that ran low."
Woodhams said it's also not clear which party's ballots ran out.
"Anecdotally, it seems some precincts were low with Republican ballots, and other precincts were low with Democratic ballots," said Woodhams.
He says voters were given alternative ways to cast their ballots, and all votes were counted.
The Bureau of Elections is reaching out to clerks across the state to determine the specific precincts affected, the number of voters affected, and how long they had to wait for a substitute ballot, Woodhams said.
He attributed the ballot shortage to Tuesday's record voter turnout of 2.5 million, which he said is the highest in a Michigan presidential primary in its 44-year history.
"That's twice the number of voters that participated in 2000 and a million more than 2008," said Woodhams.