Excel 2007 made Excel XP file's hyperlink font Calibri

[yuryyuryyury]

I opened an excel xp workbook in office 2007, and saved it (as old xls). When I insert a hyperlink (and only a hyperlink), the hyperlink is formatted with calibri 11 font, instead of the default arial 10. I double checked that the default font in my excel is arial, and it is. Any way to reset this particular thing for hyperlinks?