diff --git a/dts/arc/arc_iot.dtsi b/dts/arc/arc_iot.dtsi
index 08b86a0eaf4..8729e3f8407 100644
--- a/dts/arc/arc_iot.dtsi
+++ b/dts/arc/arc_iot.dtsi
@@ -17,7 +17,7 @@
 		cpu@0 {
 			device_type = "cpu";
 			compatible = "snps,arcem";
-			reg = <1>;
+			reg = <0>;
 		};
 
 		intc: arcv2-intc {
diff --git a/dts/arc/emsk.dtsi b/dts/arc/emsk.dtsi
index ffa0d89c09c..0e76e0c5f8a 100644
--- a/dts/arc/emsk.dtsi
+++ b/dts/arc/emsk.dtsi
@@ -18,7 +18,7 @@
 		cpu@0 {
 			device_type = "cpu";
 			compatible = "snps,arcem";
-			reg = <1>;
+			reg = <0>;
 		};
 
 		intc: arcv2-intc {