New York City’s taxi commission chief says the scam thought to have cheated 1.8 million riders is smaller than officials first believed.

The head of the city’s Taxi and Limousine Commission told the City Council on Monday that a “significant” number of trips were not actually overcharged.

The button to activate the higher rate code was pushed at the end of the trip instead of the beginning.

Officials believe this is because the button is right next to the one the driver pushes to end the trip.

So some trips that officials initially thought were charged on the higher rate code were not. The code was likely accidentally activated when the taxi was stopped at the end of the trip.

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