diff --git a/pkgs/development/python-modules/mox3/default.nix b/pkgs/development/python-modules/mox3/default.nix
new file mode 100644
index 00000000000..8701ea177b0
--- /dev/null
+++ b/pkgs/development/python-modules/mox3/default.nix
@@ -0,0 +1,40 @@
+{ stdenv
+, buildPythonPackage
+, fetchPypi
+, python
+, subunit
+, testrepository
+, testtools
+, six
+, pbr
+, fixtures
+, isPy36
+}:
+
+buildPythonPackage rec {
+  pname = "mox3";
+  version = "0.23.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0q26sg0jasday52a7y0cch13l0ssjvr4yqnvswqxsinj1lv5ld88";
+  };
+
+  patchPhase = ''
+    sed -i 's@python@${python.interpreter}@' .testr.conf
+  '';
+
+  buildInputs = [ subunit testrepository testtools six ];
+  propagatedBuildInputs = [ pbr fixtures ];
+
+  #  FAIL: mox3.tests.test_mox.RegexTest.testReprWithFlags
+  #  ValueError: cannot use LOCALE flag with a str pattern
+  doCheck = !isPy36;
+
+  meta = with stdenv.lib; {
+    description = "Mock object framework for Python";
+    homepage = https://docs.openstack.org/mox3/latest/;
+    license = licenses.asl20;
+  };
+
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index b83e7a9b295..942e3f6c23a 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -3061,26 +3061,7 @@ in {
 
   mecab-python3 = callPackage ../development/python-modules/mecab-python3 { };
 
-  mox3 = buildPythonPackage rec {
-    name = "mox3-${version}";
-    version = "0.23.0";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/m/mox3/${name}.tar.gz";
-      sha256 = "0q26sg0jasday52a7y0cch13l0ssjvr4yqnvswqxsinj1lv5ld88";
-    };
-
-    patchPhase = ''
-      sed -i 's@python@${python.interpreter}@' .testr.conf
-    '';
-
-    #  FAIL: mox3.tests.test_mox.RegexTest.testReprWithFlags
-    #  ValueError: cannot use LOCALE flag with a str pattern
-    doCheck = !isPy36;
-
-    buildInputs = with self; [ subunit testrepository testtools six ];
-    propagatedBuildInputs = with self; [ pbr fixtures ];
-  };
+  mox3 = callPackage ../development/python-modules/mox3 { };
 
   doc8 = callPackage ../development/python-modules/doc8 { };