The Stormont Assembly voted against a motion which would see Northern Ireland awarded 'special status' during the Brexit process.
The measure was proposed by the SDLP and MLAs later voted against by 47 votes to 46.
This latest development means that it made be more difficult for the British and Irish governments to seek special treatment for the North during Brexit negotiations.
SDLP West Tyrone MLA Daniel McCrossan described the vote as disappointing in an interview with Highland Radio.
"This was an opportunity for us to send a message out to the 56% of our constituents throughout Northern Ireland who voted Remain that we want to all we can to make sure that vote is respected," he said.
"It is no shock that the DUP and other Unionist parties voted Against but it was a very tight result in that there was one vote in terms of a majority in defeating the motion so what I would say is that this is not going to put us off from our overarching plan to ensure that we get some form of recognition for the Remain vote here in Northern Ireland," McCrossan concluded.
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