Plans to open youth clubs for teenagers with autism in Northants could be stopped unless more members are found.
The scheme was set up by the National Autistic Society, with Big Lottery Fund grants, to offer teenagers with the condition the chance to mix.
The clubs were to open later this year but need 40 members, the society said.
Andy Bloice, of Families of Aspergers Children Together (FACT), said if the groups are cancelled it will impact on teenagers in the area.
Mr Bloice, who has a 12-year-old son, Jake, with Aspergers Syndrome - a form of autism - said: "We want to give Jake as much as possible and obviously the best way for Jake to learn really is to be with his peers.
"If he's in a like minded group as himself then it's a lot easier on him and that's a massive way for him to take leaps forward and hopefully make his school life easier."