Southend United boss Paul Sturrock says his tactical mistake cost his side in Saturday's draw at home with Morecambe.
The Shrimpers, who are second in League Two, went a goal down before battling back to claim a point.
"I've got to put my hand up because I changed things around at the start of the second half and it cost us a goal," Sturrock told BBC Essex.
"When I ask my players to look at their own performance I have to be honest and say I've maybe cost us dear today."
The result saw Southend knocked off the top of League Two by Crawley but Sturrock remained positive about their preformance.
"I thought we came up against a very strong side, one that knows how to play away from home," he added.
"It's one point gained rather than two lost because we were in a losing position."