Lincoln edged closer to safety with a goalless draw against Cambridge.
Nathan Blissett headed wide from a corner for the visitors and Nat Brown almost nodded into his own net as the U's finished a poor first half on top.
The hosts were much brighter after the break and Vadaine Oliver flashed an effort narrowly over the bar before nodding another chance wide but neither side could break the deadlock.
The point gives the Imps a four-point cushion above the relegation zone.
VIEW FROM THE DRESSING ROOM
Lincoln City manager Gary Simpson told BBC Radio Lincolnshire:
"The pitch was as dry as a bone and it was bobbly, we couldn't get the ball down in the final third and open them up like we wanted to. It wasn't a classic game but the positives were that we kept another clean sheet and it's another point closer to where we want to be.
"In the first half they were a bit better than us but we had a word at half-time and I thought we got to grips with them better [in the second half]. We're disappointed that we didn't win but they were a solid, strong team and it was a hard battle and a draw was probably a fair result.
"I don't think it's an outstanding league which is why everyone's still in it [a relegation battle], so I think we need certainly one more win.
"Three points might do but I've laid down a challenge to the players to go unbeaten to the end of the season."