diff --git a/configs/roc-cc-rk3308_defconfig b/configs/roc-cc-rk3308_defconfig
index 670211e..0a029c4 100644
--- a/configs/roc-cc-rk3308_defconfig
+++ b/configs/roc-cc-rk3308_defconfig
@@ -74,6 +74,7 @@
 CONFIG_BAUDRATE=1500000
 CONFIG_DEBUG_UART_SHIFT=2
 CONFIG_DEBUG_UART_SKIP_INIT=y
+CONFIG_SYS_NS16550_MEM32=y
 CONFIG_SYSRESET=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y