diff --git a/pkgs/development/ocaml-modules/csexp/default.nix b/pkgs/development/ocaml-modules/csexp/default.nix
index 4f72a3c0954..e8196278075 100644
--- a/pkgs/development/ocaml-modules/csexp/default.nix
+++ b/pkgs/development/ocaml-modules/csexp/default.nix
@@ -1,4 +1,4 @@
-{ lib, fetchurl, buildDunePackage }:
+{ lib, fetchurl, buildDunePackage, liquidsoap }:
 
 buildDunePackage rec {
   pname = "csexp";
@@ -11,6 +11,10 @@ buildDunePackage rec {
 
   minimalOCamlVersion = "4.03";
 
+  passthru.tests = {
+    inherit liquidsoap;
+  };
+
   meta = with lib; {
     description = "Minimal support for Canonical S-expressions";
     homepage = "https://github.com/ocaml-dune/csexp";