Multiple Antminer U1 using cgminer

Hi!

I just received 2 Antminer U1 miners and installed the correct driver, downloaded the customized version of cgminer from Github (https://github.com/AntMiner/AntGen1/tree/master/cgminer).
Both miners work fine, but when I plug them in both (using a powered USB hub) only one is recognized and I get the following error:

Code:

[2014-01-14 16:04:47] Bitmain detect (8:5) failed to initialise (incorrect device?)

I am running Windows 8.1 x64

Does anyone know how to get both miners working at the same time?

Thanks in advance!

//Jasper