diff --git a/src/mainboard/amd/persimmon/devicetree.cb b/src/mainboard/amd/persimmon/devicetree.cb
index 7da216921f..b47e6b9892 100644
--- a/src/mainboard/amd/persimmon/devicetree.cb
+++ b/src/mainboard/amd/persimmon/devicetree.cb
@@ -87,6 +87,8 @@ chip northbridge/amd/agesa/family14/root_complex
 					device pci 15.1 off end # PCIe PortB
 					device pci 15.2 off end # PCIe PortC
 					device pci 15.3 off end # PCIe PortD
+					device pci 16.0 off end # OHCI USB3
+					device pci 16.2 off end # EHCI USB3
 					register "gpp_configuration" = "0" #4:0:0:0 (really need to disable all 4 somehow)
 		  			register "boot_switch_sata_ide" = "0"	# 0: boot from SATA. 1: IDE
 				end	#southbridge/amd/cimx/sb800