Expand vmdk that is larger that 2Tb

I've upgrade to Esxi 5.5 already and created a vmdk to 4.7 Tb and would like to expand it to 5.6 Tb.  I get the following error message when I attempt to expand it and I don't know why or how to bypass it: Hot-extend was invoked with size (12025908428 sectors) >= 2TB. Hot-extend beyond or equal to 2TB is not supported.