diff --git a/arch/sandbox/dts/overlay0.dts b/arch/sandbox/dts/overlay0.dtso
similarity index 100%
rename from arch/sandbox/dts/overlay0.dts
rename to arch/sandbox/dts/overlay0.dtso
diff --git a/arch/sandbox/dts/overlay1.dts b/arch/sandbox/dts/overlay1.dtso
similarity index 100%
rename from arch/sandbox/dts/overlay1.dts
rename to arch/sandbox/dts/overlay1.dtso