The 1D star couldn't be heard properly during his solo as the boys performed 'Kiss You' live from the Manchester Arena.
One fifth of One Direction looked visibly distressed as he attempted to sing through the technical fault.
But he was seen ranting to bandmate Harry Styles at the end of the track - and pointing to the place on the stage where he suffered the embarrassment.
You'd have hoped they'd have triple checked the wiring, wouldn't you?
At least Zayn didn't look as FURIOUS as XF judge Nicole did on Saturday night when she lost sound on her mic when duetting with her act Jahmene.
Nicole started furiously pointing and waving at Jahmene whilst they were singing 'Greatest Love' by Whitney Houston and her handset stopped working.
In the end the pair did an awkward duet whilst sharing one mic - leaving the Pussycat Doll star furious and host Dermot O'Leary apologetic.
WATCH NICOLE'S MIC FAIL HERE
What's more, we spotted that winner James Arthur seemed to have problems making himself heard when he accepted his crown tonight.
The singer-songwriter also appeared to have microphone problems when answering Dermot's questions at the end of the show.
But we're not sure if that was just his man-of-few-soft-words persona.
Either way, we think they should have someone checking Chris Maloney's nan wasn't around the back cutting wires...
[Related story: James Arthur WINS X Factor 2012]
[Related story: Chris Maloney topped the vote for the first 7 weeks]