diff --git a/configs/rock960-rk3399_defconfig b/configs/rock960-rk3399_defconfig
index 78e50db..bb5b214 100644
--- a/configs/rock960-rk3399_defconfig
+++ b/configs/rock960-rk3399_defconfig
@@ -74,6 +74,7 @@
 CONFIG_USB_EHCI_GENERIC=y
 CONFIG_USB_OHCI_HCD=y
 CONFIG_USB_OHCI_GENERIC=y
+CONFIG_SYS_USB_OHCI_MAX_ROOT_PORTS=2
 CONFIG_USB_DWC3=y
 CONFIG_USB_KEYBOARD=y
 CONFIG_USB_HOST_ETHER=y