diff --git a/build/Android.common_build.mk b/build/Android.common_build.mk
index 3000cdf..36c9342 100644
--- a/build/Android.common_build.mk
+++ b/build/Android.common_build.mk
@@ -191,6 +191,7 @@
   -Wunreachable-code \
   -Wredundant-decls \
   -Wshadow \
+  -Wunused \
   -fvisibility=protected \
   $(art_default_gc_type_cflags)