diff --git a/pkgs/development/python-modules/dynd/default.nix b/pkgs/development/python-modules/dynd/default.nix
new file mode 100644
index 000000000000..8d8fbf7a7cef
--- /dev/null
+++ b/pkgs/development/python-modules/dynd/default.nix
@@ -0,0 +1,43 @@
+{ stdenv
+, buildPythonPackage
+, fetchFromGitHub
+, isPyPy
+, isPy3k
+, cython
+, numpy
+, pkgs
+}:
+
+buildPythonPackage rec {
+  version = "0.7.2";
+  pname = "dynd";
+  disabled = isPyPy || !isPy3k; # tests fail on python2, 2018-04-11
+
+  src = pkgs.fetchFromGitHub {
+    owner = "libdynd";
+    repo = "dynd-python";
+    rev = "v${version}";
+    sha256 = "19igd6ibf9araqhq9bxmzbzdz05vp089zxvddkiik3b5gb7l17nh";
+  };
+
+  # setup.py invokes git on build but we're fetching a tarball, so
+  # can't retrieve git version. We hardcode:
+  preConfigure = ''
+    substituteInPlace setup.py --replace "ver = check_output(['git', 'describe', '--dirty'," "ver = '${version}'"
+    substituteInPlace setup.py --replace "'--always', '--match', 'v*']).decode('ascii').strip('\n')" ""
+  '';
+
+  # Python 3 works but has a broken import test that I couldn't
+  # figure out.
+  doCheck = !isPy3k;
+  buildInputs = [ pkgs.cmake pkgs.libdynd.dev cython ];
+  propagatedBuildInputs = [ numpy pkgs.libdynd ];
+
+  meta = with stdenv.lib; {
+    homepage = http://libdynd.org;
+    license = licenses.bsd2;
+    description = "Python exposure of dynd";
+    maintainers = with maintainers; [ teh ];
+  };
+
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index aa1389999539..935b79ab21cd 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -2968,38 +2968,7 @@ in {
 
   nwdiag = callPackage ../development/python-modules/nwdiag { };
 
-  dynd = buildPythonPackage rec {
-    version = "0.7.2";
-    name = "dynd-${version}";
-    disabled = isPyPy || !isPy3k; # tests fail on python2, 2018-04-11
-
-    src = pkgs.fetchFromGitHub {
-      owner = "libdynd";
-      repo = "dynd-python";
-      rev = "v${version}";
-      sha256 = "19igd6ibf9araqhq9bxmzbzdz05vp089zxvddkiik3b5gb7l17nh";
-    };
-
-    # setup.py invokes git on build but we're fetching a tarball, so
-    # can't retrieve git version. We hardcode:
-    preConfigure = ''
-      substituteInPlace setup.py --replace "ver = check_output(['git', 'describe', '--dirty'," "ver = '${version}'"
-      substituteInPlace setup.py --replace "'--always', '--match', 'v*']).decode('ascii').strip('\n')" ""
-    '';
-
-    # Python 3 works but has a broken import test that I couldn't
-    # figure out.
-    doCheck = !isPy3k;
-    buildInputs = with pkgs; [ cmake libdynd.dev self.cython ];
-    propagatedBuildInputs = with self; [ numpy pkgs.libdynd ];
-
-    meta = {
-      homepage = http://libdynd.org;
-      license = licenses.bsd2;
-      description = "Python exposure of dynd";
-      maintainers = with maintainers; [ teh ];
-    };
-  };
+  dynd = callPackage ../development/python-modules/dynd { };
 
   langcodes = callPackage ../development/python-modules/langcodes { };