Victoria's Planning Minister says the Opposition should apologise for referring him to the state's anti-corruption commission after it was ruled the complaint had no basis in fact or law.

In March, Fairfax Media reported Matthew Guy helped approve planning applications after dining with developers who had paid $10,000 to the Liberal Party's fundraising arm.

Labor complained to the ombudsman, who notified the Independent Broad-Based Anti-Corruption Commission (IBAC).

But IBAC commissioner Stephen O'Bryan says the reference from the ombudsman was invalid and it would not investigate the complaint.

Mr Guy says it was a disgraceful personal attack from his opponents.

"For the Labor Party to play to the lowest common denominator, to try to smear myself and my family name simply by using a new independent corruption commission body name to smear me really is disgraceful," he said.

"That is more a reflection upon them than it is me.

"I simply say to the Australian Labor Party: grow up, start focusing on policy, start presenting a genuine alternative to the people of Victoria and get out of the gutter."

But the Victorian Opposition says it has exposed a major flaw in the state's anti-corruption legislation.

The Opposition's planning spokesman, Brian Tee, says the anti-corruption body should have scrutinised the claims.

"IBAC and the ombudsman can't agree whether this serious allegation involves corrupt conduct," he said.

"Because of that, it looks like these allegations may never be investigated.

"IBAC has failed its first test.

"Dr Napthine has got to admit that there is a serious flaw in the jurisdiction of IBAC.

"The public are losing out because serious allegations will never be investigated."