diff --git a/scripts/gen-hart-dts.py b/scripts/gen-hart-dts.py
index f02e33d..178ec4b 100644
--- a/scripts/gen-hart-dts.py
+++ b/scripts/gen-hart-dts.py
@@ -68,6 +68,7 @@ def dtsi_template (cpu_list: str, plic_list, sswi_list, mtimer_list, mswi_list,
 
         sswi0: sswi@4500000 {{
           #interrupt-cells = <0>;
+          #address-cells = <0>;
           interrupt-controller;
           interrupts-extended = {sswi_list};
           reg = <0x4500000 0x4000>;
@@ -76,6 +77,7 @@ def dtsi_template (cpu_list: str, plic_list, sswi_list, mtimer_list, mswi_list,
 
         mswi0: mswi@4400000 {{
           #interrupt-cells = <0>;
+          #address-cells = <0>;
           interrupt-controller;
           interrupts-extended = {mswi_list};
           reg = <0x4400000 0x4000>;