minor sales tax glitch in 1.8.4

[Diamond Edge Company]

I just invoiced a customer for a $150.00 item with a sales tax rate of 6.75%
gnucash figured the tax as $10.125 and when the invoice was produced for 
printing, it output $10.12 rather than rounding up to $10.13 which is the 
convention, at least in this state for figuring sales tax amount.  
Does this need to be fixed or is there something I can configure.  
Smitty