Ford will delay deliveries for hundreds of its Mustang mach-e vehicles. Some buyers said that their upcoming delivery dates had been pushed back, by as long as a month in some cases.

The Mustang mach-e SUV is Ford’s first update to the iconic Mustang brand ever. It is the company’s biggest foray into the EV marketplace.

Ford did n’t immediately return a request for comment from the verge on Saturday. A spokesperson told Electrek it was doing’additional quality checks’ on several hundred SUVs built before dealer shipments began in December.