diff --git a/dune-project b/dune-project
index e10293ee3..1123224bc 100644
--- a/dune-project
+++ b/dune-project
@@ -50,7 +50,7 @@
   (integers
    (>= 0.5.1))
   ocaml_intrinsics
-  prelude
+  (prelude (<= 0.1))
   sedlex
   (smtml (>= 0.2.2))
   uutf
diff --git a/owi.opam b/owi.opam
index 7558dacf8..b6b3a59b4 100644
--- a/owi.opam
+++ b/owi.opam
@@ -27,7 +27,7 @@ depends: [
   "digestif"
   "integers" {>= "0.5.1"}
   "ocaml_intrinsics"
-  "prelude"
+  "prelude" {<= "0.1"}
   "sedlex"
   "smtml" {>= "0.2.2"}
   "uutf"