diff --git a/src/dune b/src/dune
index 1ee3eba7..ee350ab0 100644
--- a/src/dune
+++ b/src/dune
@@ -4,5 +4,5 @@
   (public_name tiny_httpd)
   (libraries threads)
   (inline_tests (backend qtest.lib))
-  (flags :standard -safe-string)
+  (flags :standard -safe-string -warn-error -a+8)
   (wrapped false))