Lincoln manager Chris Sutton feels a weakness at set-pieces has cost them at both ends in recent matches.
The Imps have conceded from a corner or free-kick in each of their last three games, but have found goals from their own set-pieces hard to come by.
Sutton told BBC Lincolnshire: "Since I came in the count is seven or eight to one against us, which we must address.
"You can coach all you like, but you need players who want to head the ball and we have to do better."
He added: "We need to get back to basics and keeping clean sheets.
"It's not like we're conceding an abundance of goals but we're making it difficult for ourselves."
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