diff --git a/pkgs/development/libraries/libmpack/default.nix b/pkgs/development/libraries/libmpack/default.nix
index 867a7ccf79d..b45d5f3d2ce 100644
--- a/pkgs/development/libraries/libmpack/default.nix
+++ b/pkgs/development/libraries/libmpack/default.nix
@@ -10,6 +10,7 @@ stdenv.mkDerivation rec {
     inherit rev;
     sha256 = "1h3pbmykm69gfyi0wz647gz5836a6f3jc4azzll7i3mkpc11gcrd";
   };
+  LIBTOOL = "libtool";
   buildInputs = [ libtool ];
   installPhase = ''
     mkdir -p $out/lib/libmpack