Possible Duplicate:
Mistaken downvote cannot be undone after matter is being clarified by the answerer

If I press the upvote or downvote by mistake and later I realize that I want to cancel the effect and bring it back to what it was before, then I don't find option to do it.

It just happened today; I downvoted instead of giving it an upvote. Later I thought by giving it a downvote will cancel the effect of upvote but nothing. Can someone throw some light on this behavior of voting?

marked as duplicate by Shadow The Dragon Wizard, Cody Gray, Jeff Atwood May 19 '11 at 9:21

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • 1
    You can ask the OP to edit the question then you'll be able to undo. – Shadow The Dragon Wizard May 19 '11 at 8:26

A vote gets "locked in" after 5 minutes. After that, you can only change it if the post gets edited.

See also this question for more info:

Vote too old to be changed, unless post is edited

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