Sir Keir Starmer said Labour would make the student fees system fairer in England but didn't give any details about what their plans would look like.
Scrapping university tuition fees was one of his pledges during his leadership campaign.
But in May the Labour leader said a "difficult financial situation" meant it would probably have to be dropped.
Speaking to BBC Newsbeat in West Sussex earlier, Sir Keir said the current system was "unfair and ineffective".
In response, the government said there were lots of opportunities for students to access higher education and support.
It comes after Sir Keir said university would be out of reach for him if he was applying as a student today and the cost of living crisis was holding young people back.
"We do need to change that and we will come up with a fairer package for students that helps them with the money they have to outlay," he said.
Newsbeat spoke to him at a seaside cafe in Worthing and asked what that system would look like.
But he didn't give any details, adding: "That's work in progress.
"It will be a fairer system but on a wider package, how do we get our energy bills down, how do we get our food bills down, how do we ensure our economy is actually booming and people feel like they've got money in their pocket again."
