It looked as though hosting Millwall were going to have to settle for a point against a team that were reduced to 10 men early in the second half.
"Any win in the Championship is hard-earned and this was no exception. Millwall vs. Leeds games are always very passionate. We're pleased to come out on top against a side as big as Leeds," Jackett told reporters.
"We've put together the run by reducing the goals against. It was another great clean sheet from the whole team."
The three points have lifted Millwall up to ninth in the Championship table.