diff --git a/src/lib/pickles/dune b/src/lib/pickles/dune
index 78b5dc2fe2e..3d162fd1e05 100644
--- a/src/lib/pickles/dune
+++ b/src/lib/pickles/dune
@@ -4,10 +4,7 @@
  (name pickles)
  (public_name pickles)
  (modules_without_implementation full_signature type intf pickles_intf)
- (flags
-  (:standard -w +a-40..42-44 -warn-error +a-27)
-  -open
-  Core_kernel)
+ (flags -open Core_kernel)
  (instrumentation
   (backend bisect_ppx))
  (preprocess