Members of the Association of Garda Sergeants and Inspectors have voted to accept the Lansdowne Road Agreement following a ballot.
Nearly 70% of the union's members voted on the proposals, with 71% voting in favour.
In a statement AGSI General Secretary John Jacob said: "We supported a deal which is far from what our members need and want but which they are forced to accept because of the inability to sustain an increment freeze and the hardship it would bring.
He said the "Government agreed to lift a two-year increment freeze on July 1st pending the outcome of a ballot of members on the LRA."
Among the Government proposals was agreement on how the Haddington Road hours would be used to introduce consistency across the organisation.
The AGSI will have direct access to future pay talks on an equal basis with other bodies and will have access to the Labour Relations Commission and the Labour Court.
Last June the AGSI said it would re-ballot its members following a rejection of the public sector pay agreement.
The agreement was due to come into effect on 1 July when the Haddington Road Agreement expired.
Under the Haddington Road Agreement, gardaí were obliged to do an extra 30 unpaid hours per year until the end of December 2015.
Yesterday the Teachers' Union of Ireland, which has accepted the Lansdowne Roads Agreement, said that it may be forced to consider industrial action unless progress is made on restoring pay allowances for teachers new to the profession.
When the union voted to accept the agreement last May, it agreed on a range of issues with the Department of Education.
It said that a key understanding underpinning the agreement was that pay inequality would be addressed as a matter of urgency.
Last June, the Association of Secondary Teachers in Ireland voted to reject the Lansdowne Road Agreement.