diff --git a/cohttp-async.opam b/cohttp-async.opam
index 41c5a3b6f5..35eeb72540 100644
--- a/cohttp-async.opam
+++ b/cohttp-async.opam
@@ -32,7 +32,7 @@ depends: [
   "logs"
   "fmt"
   "sexplib"
-  "ppx_sexp_conv" {build & >="v0.9.0"}
+  "ppx_sexp_conv" {>= "v0.9.0"}
   "ounit" {test}
 ]
 available: [ocaml-version >= "4.03.0"]
diff --git a/cohttp-lwt.opam b/cohttp-lwt.opam
index 7d943c7181..75c1174a00 100644
--- a/cohttp-lwt.opam
+++ b/cohttp-lwt.opam
@@ -24,7 +24,7 @@ depends: [
   "cohttp" {>= "1.0.0"}
   "lwt"
   "sexplib"
-  "ppx_sexp_conv" {build & >="v0.9.0"}
+  "ppx_sexp_conv" {>= "v0.9.0"}
 ]
 conflicts: [
   "lwt" {< "2.5.0"}
diff --git a/cohttp.opam b/cohttp.opam
index 3f5cd4beb6..b23bce35d5 100644
--- a/cohttp.opam
+++ b/cohttp.opam
@@ -25,9 +25,8 @@ depends: [
   "uri" {>= "1.9.0"}
   "fieldslib"
   "sexplib"
-  "ppx_type_conv" {build & >="v0.9.1"}
-  "ppx_fields_conv" {build & >="v0.9.0"}
-  "ppx_sexp_conv" {build & >="v0.9.0"}
+  "ppx_fields_conv" {>= "v0.9.0"}
+  "ppx_sexp_conv" {>= "v0.9.0"}
   "stringext"
   "base64" {>= "2.0.0"}
   "fmt" {test}