diff --git a/configs/pinebook-pro-rk3399_defconfig b/configs/pinebook-pro-rk3399_defconfig
index 528b7bb..dfbf5e7 100644
--- a/configs/pinebook-pro-rk3399_defconfig
+++ b/configs/pinebook-pro-rk3399_defconfig
@@ -80,6 +80,7 @@
 CONFIG_RNG_ROCKCHIP=y
 CONFIG_BAUDRATE=1500000
 CONFIG_DEBUG_UART_SHIFT=2
+CONFIG_SYS_NS16550_MEM32=y
 CONFIG_ROCKCHIP_SPI=y
 CONFIG_SYSRESET=y
 CONFIG_USB=y