GCSB boss Ian Fletcher has confirmed former Green MP and activist Keith Locke was not among the 88 New Zealanders his bureau may have spied on illegally.
Mr Fletcher made the rare admission after initially refusing to answer, prompting Mr Locke to take the matter to the Privacy Commissioner.
In a letter to Mr Locke last week Mr Fletcher confirmed he was not spied on.
Mr Locke posed the question after a report by senior public servant Rebecca Kitteridge uncovered a string of issues around the spy agency's compliance with relevant legislation.
Her report prompted an overhaul of the legislation which was concluded yesterday with the passing of the Telecommunications (Interception Capability and Security) Act.