diff --git a/pkgs/development/ocaml-modules/batteries/default.nix b/pkgs/development/ocaml-modules/batteries/default.nix
index 3b2da021c212..a6a2974ce53c 100644
--- a/pkgs/development/ocaml-modules/batteries/default.nix
+++ b/pkgs/development/ocaml-modules/batteries/default.nix
@@ -3,6 +3,7 @@
   fetchFromGitHub,
   buildDunePackage,
   ocaml,
+  ounit,
   qtest,
   qcheck,
   num,
@@ -24,7 +25,10 @@ buildDunePackage rec {
   };
 
   nativeCheckInputs = [ qtest ];
-  checkInputs = [ qcheck ];
+  checkInputs = [
+    ounit
+    qcheck
+  ];
   propagatedBuildInputs = [
     camlp-streams
     num