diff --git a/ox-plic.dts b/ox-plic.dts
index af572d7..439e34b 100644
--- a/ox-plic.dts
+++ b/ox-plic.dts
@@ -88,7 +88,7 @@
 		ranges;
 		SERIAL: serial@40001000 {
 			compatible = "ns16550";
-			reg = <0x0 0x40001000 0x0 0x100>;
+			reg = <0x0 0x40001000 0x0 0x1000>;
 			interrupts = <1>; /* Output interrupt 1 */
 			interrupt-parent = <&PLIC>;
 			reg-shift = <2>;