diff --git a/test/Preprocessor/warn-macro-unused.h b/test/Preprocessor/warn-macro-unused.h
new file mode 100644
index 0000000000..0c2c267fcf
--- /dev/null
+++ b/test/Preprocessor/warn-macro-unused.h
@@ -0,0 +1 @@
+#define unused_from_header