Depends on a couple of things.
1. How much of your current stash is this?
2. How bothered are you by this?
3. Have you looked into the stock? Is the fundamental thesis of investing in this stock still intact? Stocks move up and down, and last week was a broader market decline to boot, do not expect that you'll be investing in a stock at the very bottom of it's trading range, this is one of the benefits of decent dividend payers, if they drop, you dejectedly smile, say "well, DRIP will perform better for me here!" and move on.
The answer to these questions, and what to do, is up to you.
Edit: Also important is how long your viewpoint is. In the short term, the stock market is a popularity contest, and right now your stock sounds like Justin Bieber, but is it? In the long term, is it The Beatles? In the long term the stock market acts as a weighing machine.