Lincoln's charge towards promotion was stalled as they were held to a 1-1 draw with relegation-threatened Macclesfield.
The League Two leaders were stunned when Sol Campbell's battling side took the lead on 28 minutes when Elliott Durrell found Scott Wilson and he impressively swept the ball home.
However, the home fans did not have to wait long for a reply. Bruno Andrade put the Macc defence on the back foot with a surging run forward before being tripped a couple of yards outside the box.
Neal Eardley took the resulting free-kick and placed it perfectly into the top corner of the net to make it 1-1 on 38 minutes.
The Imps pinned Town back in the early stages of the second half, with Eardley almost scoring again when his cross-shot was beaten away by a flying O'Hara.
But the Imps were frustrated by the visitors thereafter.
Having offered virtually nothing as an attacking force in the second half, Macc almost reclaimed the lead with six minutes left when James Pearson unleashed a fierce dipping volley which was tipped over by Matt Gilks.