A council in East Yorkshire is asking people to check the ice cream van they are buying from is properly licensed.
East Riding of Yorkshire Council wants people in Hornsea, Bridlington, Hessle and Beverley to report unlicensed ice cream sellers.
Officials say the rogue traders aren't just taking business away from legitimate sellers but also pose a threat to public health.
Mobile ice cream vans need a licence to trade within the East Riding and a number of conditions are attached to the licenses in order to protect the public.
The council says it will act on any reports of rogue ice cream sellers and those who break the rules can be prosecuted and face fines of up to £1,000 for each offence.