diff --git a/config/kernel/linux-rockchip64-dev.config b/config/kernel/linux-rockchip64-dev.config
index 587e555680..67eae508a0 100644
--- a/config/kernel/linux-rockchip64-dev.config
+++ b/config/kernel/linux-rockchip64-dev.config
@@ -2754,8 +2754,8 @@ CONFIG_SERIAL_8250_CONSOLE=y
 CONFIG_SERIAL_8250_DMA=y
 CONFIG_SERIAL_8250_PCI=y
 CONFIG_SERIAL_8250_EXAR=y
-CONFIG_SERIAL_8250_NR_UARTS=4
-CONFIG_SERIAL_8250_RUNTIME_UARTS=4
+CONFIG_SERIAL_8250_NR_UARTS=5
+CONFIG_SERIAL_8250_RUNTIME_UARTS=5
 CONFIG_SERIAL_8250_EXTENDED=y
 # CONFIG_SERIAL_8250_MANY_PORTS is not set
 # CONFIG_SERIAL_8250_ASPEED_VUART is not set