Attorney-General Chris Finlayson has had to make a second amendment to his declarations on the MPs' register of pecuniary interests.
The Labour Party raised questions last week about Mr Finlayson's position as a director in a company that was not listed on the register.
Mr Finlayson said he did not declare the directorship because he had no pecuniary interest in company, which was set up as a corporate trustee for a friend's family trust.
However, he received advice from the Registrar of Pecuniary Interests that all directorships should be declared.
In Parliament on Tuesday, Labour named another company of which Mr Finlayson was a director in 2006.
A spokesperson for Mr Finlayson says that company was also a corporate trustee for another family trust, and the MP has now amended previous registers and declared both directorships.