diff --git a/src/dune b/src/dune
index 1ee3eba7..3ff42e4e 100644
--- a/src/dune
+++ b/src/dune
@@ -3,6 +3,6 @@
   (name tiny_httpd)
   (public_name tiny_httpd)
   (libraries threads)
-  (inline_tests (backend qtest.lib))
+  (inline_tests (backend qtest.lib) (flags :standard -warn-error -a+8))
   (flags :standard -safe-string)
   (wrapped false))