diff --git a/pkgs/development/python-modules/backports_unittest-mock/default.nix b/pkgs/development/python-modules/backports_unittest-mock/default.nix
new file mode 100644
index 00000000000..e64f51fe7ca
--- /dev/null
+++ b/pkgs/development/python-modules/backports_unittest-mock/default.nix
@@ -0,0 +1,22 @@
+{ stdenv, buildPythonPackage, fetchPypi, setuptools_scm, mock }:
+
+buildPythonPackage rec {
+  name = "${pname}-${version}";
+  pname = "backports.unittest_mock";
+  version = "1.3";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0xdkx5wf5a2w2zd2pshk7z2cvbv6db64c1x6v9v1a18ja7bn9nf6";
+  };
+
+  propagatedBuildInputs = [ mock ];
+
+  buildInputs = [ setuptools_scm ];
+
+  meta = with stdenv.lib; {
+    description = "Provides a function install() which makes the mock module";
+    homepage = https://github.com/jaraco/backports.unittest_mock;
+    license = licenses.mit;
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index a4bd8e43b45..54367512727 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1259,6 +1259,8 @@ in {
     };
   };
 
+  backports_unittest-mock = callPackage ../development/python-modules/backports_unittest-mock {};
+
   babelfish = buildPythonPackage rec {
     version = "0.5.5";
     name = "babelfish-${version}";