diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index d9aaf128ad..e67ff3235e 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -833,4 +833,4 @@ PHONY += dtbs
 dtbs: $(addprefix $(obj)/, $(dtb-y))
 	@:
 
-clean-files := *.dtb *_HS
+clean-files := *.dtb *.dtbo *_HS