diff --git a/boards/arc/nsim/nsim.dtsi b/boards/arc/nsim/nsim.dtsi
index 24ee967ad1ea4..cdc547b0369a3 100644
--- a/boards/arc/nsim/nsim.dtsi
+++ b/boards/arc/nsim/nsim.dtsi
@@ -23,7 +23,7 @@
 
 	uart0: uart@f0000000 {
 		compatible = "ns16550";
-		clock-frequency = <50000000>;
+		clock-frequency = <30000000>;
 		reg = <0xf0000000 0x400>;
 		current-speed = <115200>;
 		label = "UART_0";