Support for the National Party has edged back up in the latest Roy Morgan poll while both the Labour and Green Parties have slipped.
National was up two points to 48 percent while Labour was on 27.5 and the Green Party on 11.5 percent.
New Zealand First's support rose to 6.5 percent, while none of the other minor parties got anywhere near the 5 percent party vote threshold.
The Roy Morgan poll surveyed 809 people from 4-17 August.
In Colin James' average of polls, including this latest survey, the television polls and those conducted by Fairfax and the New Zealand Herald, National now sits on 50 percent, Labour on 26.3 and the Greens nearly 11.7 percent.
New Zealand First is hovering just below 5 percent, Internet Mana is on 2.6 and the Conservatives 2.3 percent.