diff --git a/dune-project b/dune-project
index 4d6b8c658..ad2ea45dd 100644
--- a/dune-project
+++ b/dune-project
@@ -83,5 +83,8 @@
   (rusage :with-dev-setup)
   (tyxml :with-dev-setup)
   (yaml :with-dev-setup)
+  (lwt :with-dev-setup)
+  (cohttp :with-dev-setup)
+  (cohttp-lwt-unix :with-dev-setup)
   )
  (sites (share binc) (share libc)))
diff --git a/owi.opam b/owi.opam
index bb649c1ad..1c506a7a5 100644
--- a/owi.opam
+++ b/owi.opam
@@ -48,6 +48,9 @@ depends: [
   "rusage" {with-dev-setup}
   "tyxml" {with-dev-setup}
   "yaml" {with-dev-setup}
+  "lwt" {with-dev-setup}
+  "cohttp" {with-dev-setup}
+  "cohttp-lwt-unix" {with-dev-setup}
 ]
 build: [
   ["dune" "subst"] {dev}