diff --git a/otherlibs/stdune/src/format.mli b/otherlibs/stdune/src/format.mli
index c78f84bd6b4..7ec92caf652 100644
--- a/otherlibs/stdune/src/format.mli
+++ b/otherlibs/stdune/src/format.mli
@@ -1,3 +1,3 @@
-val pp_infinity : int
+val pp_infinity : int [@@warning "-32"]
 
 include module type of Stdlib.Format