diff --git a/pkgs/development/libraries/volume-key/default.nix b/pkgs/development/libraries/volume-key/default.nix
index 53faf07623e..4dd01f664d1 100644
--- a/pkgs/development/libraries/volume-key/default.nix
+++ b/pkgs/development/libraries/volume-key/default.nix
@@ -13,7 +13,7 @@ in stdenv.mkDerivation rec {
     sha256 = "16qdi5s6ycsh0iyc362gly7ggrwamky8i0zgbd4ajp3ymk9vqdva";
   };
 
-  outputs = [ "out" "man" "dev" ];
+  outputs = [ "out" "man" "dev" "py" ];
 
   nativeBuildInputs = [ autoreconfHook pkgconfig gettext python2 swig ];
 
@@ -28,6 +28,11 @@ in stdenv.mkDerivation rec {
     })
   ];
 
+  makeFlags = [
+    "pyexecdir=$(py)/${python2.sitePackages}"
+    "pythondir=$(py)/${python2.sitePackages}"
+  ];
+
   meta = with stdenv.lib; {
     description = "A library for manipulating storage volume encryption keys and storing them separately from volumes to handle forgotten passphrases, and the associated command-line tool";
     homepage = https://pagure.io/volume_key/;