diff --git a/pkgs/development/ocaml-modules/twt/default.nix b/pkgs/development/ocaml-modules/twt/default.nix
index e2a627aa3609..c06449f68b4c 100644
--- a/pkgs/development/ocaml-modules/twt/default.nix
+++ b/pkgs/development/ocaml-modules/twt/default.nix
@@ -16,9 +16,9 @@ stdenv.mkDerivation {
     mkdir $out/bin
   '';
 
-  installPhase = ''
-    make install PREFIX=$out
-  '';
+  dontBuild = true;
+
+  installFlags = "PREFIX=$(out)";
 
   meta = {
     homepage = http://people.csail.mit.edu/mikelin/ocaml+twt/;