QEMU update causes Windows reactivation

After updating QEMU the guest OS's detect new hardware. As a result any Windows OS sees it as a significant change in hardware and require a reactivation.

Host OS: Ubuntu 14.04 64-bit

Guest OS's:
Windows Server 2003 R2 Enterprise
Windows Server 2008 R2 Enterprise
Windows Server 2008 R2 Web
Windows Server 2008 R2 Data Center

QEMU version: 2.0.0