diff --git a/pkgs/development/ocaml-modules/ounit/default.nix b/pkgs/development/ocaml-modules/ounit/default.nix
index 2f4a4f0437a2..fbb75e613309 100644
--- a/pkgs/development/ocaml-modules/ounit/default.nix
+++ b/pkgs/development/ocaml-modules/ounit/default.nix
@@ -7,7 +7,7 @@ stdenv.mkDerivation {
   buildInputs = [ findlib ];
   propagatedBuildInputs = [ ounit2 ];
 
-  phases = [ "unpackPhase" "installPhase" "fixupPhase" ];
+  dontBuild = true;
 
   createFindlibDestdir = true;