Illustrator export changes pixel dimensions

[ellies74213471]

Hi, I am designing an advertisement for mobile and I need the ad to be very specific dimensions: 320px W x 50px H. I have the graphic at the appropriate size, but when I go to export at 72dpi it changes the pixel dimensions to 320x55. How do I get it to keep the dimensions that I set?

[Doug A Roberts · Accepted solution]

Does your art exceed the artboard bounds at all? What method are you using to export?

If it's Export As... is 'Use Artboards' checked?

[ellies74213471]

I forgot to check "Use Artboards" - thank you!!