diff --git a/CleanSpec.mk b/CleanSpec.mk
index c91249738b..f4f79cfdce 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -208,6 +208,9 @@ $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/APPS/*)
 # 4.4.1
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
 
+# Make libart the default runtime
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************