diff --git a/src/soc/rockchip/rk3288/uart.c b/src/soc/rockchip/rk3288/uart.c
index 98477344d3..8576dc18e3 100644
--- a/src/soc/rockchip/rk3288/uart.c
+++ b/src/soc/rockchip/rk3288/uart.c
@@ -155,7 +155,7 @@ void uart_fill_lb(void *data)
 	serial.type = LB_SERIAL_TYPE_MEMORY_MAPPED;
 	serial.baseaddr = CONFIG_CONSOLE_SERIAL_UART_ADDRESS;
 	serial.baud = default_baudrate();
-	serial.regwidth = 1;
+	serial.regwidth = 4;
 	lb_add_serial(&serial, data);
 
 	lb_add_console(LB_TAG_CONSOLE_SERIAL8250MEM, data);