diff --git a/android/makevars.go b/android/makevars.go
index 149f2f88c..e431f116a 100644
--- a/android/makevars.go
+++ b/android/makevars.go
@@ -170,6 +170,7 @@ ifneq ($$($(1)),)
 else
   $(1) := $$(SOONG_$(1))
 endif
+.KATI_READONLY := $(1) SOONG_$(1)
 endef
 
 my_check_failed := false