Mayor Michael Bloomberg says the $250 million New York City schools stand to lose amid a standoff on teacher evaluations is important, but the city “cannot compromise on having a real evaluation system.”

The mayor spoke on his WOR-AM radio show Friday. On Thursday, a judge blocked the state from withholding the money, at least for now.

The judge froze any sanctions until the resolution of a lawsuit filed by parents. The state plans to appeal.

School districts had to have evaluation systems in place by Jan. 17 to get a state aid increase this school year.

Bloomberg’s administration and the teachers’ union couldn’t agree on a system, so the city missed the deadline.

The city has said the lost money means eliminating 700 guidance counselor and teacher positions.