The Labour Party has cautiously supported workplace reforms - but wants changes to zero-hour contracts before it backs them further.
The party supported the Employment Standards Legislation Bill at its second reading this afternoon.
Labour's workplace relations spokesman Iain Lees-Galloway said if its proposed amendments were adopted by the Government, it would back the legislation through its final stages.
"Today we will vote for this Bill. Next week, we will propose changes ... if the mixture of the changes that are adopted by this House are sufficient to meet our bottom lines, we will support this Bill," Mr Lees-Galloway said.
"If they are not sufficient to meet our bottom lines, I implore the Government's support parties not to cave-in, not to accept something that is watered down ... but to accept our view, and that is this - it is time to eliminate zero-hour contracts from New Zealand."