A/B Testing Pluggin Doesn't accept my Google Analytics Code

I’ve installed the A/B Theme Testing Pluggin. It installs correctly and runs as expected; however, on the Plugin configuration page the Google Analytics UA Number does not accept the full length of my Google Analytics Code UA-NNNNNNNN-N. The last digit is cut off and the code displays as UA-NNNNNNNN-

It appears this is occurring because the input field size is to small for the UA code.