A Kevin Lisbie brace ended Leyton Orient's four-match losing streak as they saw off struggling Shrewsbury.
The Shrews, without an away league win this season, fell behind when Jeremy Helan fouled Moses Odubajo in the box and Lisbie converted from the spot.
The visitors looked to be set for a point though when Jon Taylor finished an excellent move from close range.
However Lisbie stole the points on his first start in eight matches with a close-range header in the 88th minute.
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Leyton Orient boss Russell Slade told BBC London 94.9:
"It's been long awaited and I couldn't even look at the penalty. It's been tough.
"The fans don't think it's tough on the manager but it is.
"Shrewbury came back at us but we still kept going. Kevin Lisbie was the difference once again for us."
Shrewsbury Town manager Graham Turner told BBC Radio Shropshire:
"It's difficult to accept the result today, and it hurts to see the league table.
"No-one is going to give us anything at the moment - the penalty changed the mood and the crowd reacted to that.
"To concede from a corner the way we did is upsetting."