I don't think you have anything to worry around. It's not like you'll be affecting the voltage supplied to any internal components. Everything in your laptop runs on 12V, 5V, 3.3V or even less, and the power supply already has to match a much wider range of voltages as the battery charges and discharges. The power from your AC adapter will be heavily regulated before it gets near anything sensitive.
Besides, I wouldn't be surprised if a 2% variation in voltage was well within the manufacturing tolerances all for those adapters in the first place. Mountain of electronic equipment runs fine on low 12V adapters that can easily be 5-10% off.
Source: http://ask.metafilter.com/143896/Help-me-not-fry-my-new-laptop#2060188
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