US band Train says the use of their song on a New Zealand anti-gay marriage website is "upsetting" and not something they had agreed to.
Train's song Marry Me featured on the Protect Marriage website which was set up by a number of groups opposed to Labour MP Louisa Wall's marriage equality bill.
The bill was pulled from parliament's ballot last week and will have its first reading this month.
Train has now released a statement hitting back at the website for featuring their song.
"It was upsetting to us that Marry Me, a love song with no boundaries, was being used to promote an agenda we don't subscribe to".
"We [Train] take the idea of marriage very seriously, and believe it is the right of all consenting adults, regardless of sexual orientation.
"Marry Me is about just that, finding that special love and making it last forever. Everyone should be allowed to have that."
The song has since been removed from the site.