The already neck-and-neck race between two House candidates in Ohio got even tighter after election officials found 588 uncounted votes, a report said.

The find in a suburb of Columbus in Franklin County added 190 votes to Democrat Danny O’Connor’s tally, narrowing the race’s margin to 1,564, the Cincinnati Enquirer reported Wednesday.

“The votes from a portion of one voting location had not been processed into the tabulation system,” the Franklin County Board of Elections said in a statement.

Republican Troy Balderson, who was backed by President Trump, declared victory in the hotly contested special election on Tuesday when he was leading by 1,754 votes — or about 1 percentage point.

But O’Connor said he won’t concede until all the votes are counted and that includes the nearly 9,000 provisional and absentee ballots that have to be tabulated by Aug. 24.

If the margin of victory is within 0.5 points, Ohio law requires a recount.