diff --git a/test/dune b/test/dune
index 1dfd69d..16254f9 100644
--- a/test/dune
+++ b/test/dune
@@ -19,6 +19,7 @@
   (pps ppx_js_style -check-doc-comments))
  (preprocess
   (pps
+   -unused-code-warnings=force
    ppx_compare
    ppx_enumerate
    ppx_expect