diff --git a/pkgs/development/python-modules/case/default.nix b/pkgs/development/python-modules/case/default.nix
new file mode 100644
index 00000000000..7b90b1561c0
--- /dev/null
+++ b/pkgs/development/python-modules/case/default.nix
@@ -0,0 +1,20 @@
+{ stdenv, buildPythonPackage, fetchPypi
+, six, nose, unittest2, mock }:
+
+buildPythonPackage rec {
+  pname = "case";
+  version = "1.5.2";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1zbhbw87izcxj9rvqg432a7r69ps2ks20mqq3g3hgd42sckcy3ca";
+  };
+
+  propagatedBuildInputs = [ six nose unittest2 mock ];
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/celery/case;
+    description = "unittests utilities";
+    license = licenses.bsd3;
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index f16e32436c6..751d427ecfd 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1440,24 +1440,7 @@ in {
 
   carrot = callPackage ../development/python-modules/carrot {};
 
-  case = buildPythonPackage rec {
-    name = "case-${version}";
-    version = "1.5.2";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/c/case/${name}.tar.gz";
-      sha256 = "1zbhbw87izcxj9rvqg432a7r69ps2ks20mqq3g3hgd42sckcy3ca";
-    };
-
-    propagatedBuildInputs = with self; [ six nose unittest2 mock ];
-
-    meta = {
-      homepage = https://github.com/celery/case;
-      description = "unittests utilities";
-      license = licenses.bsd3;
-    };
-
-  };
+  case = callPackage ../development/python-modules/case {};
 
   cassandra-driver = buildPythonPackage rec {
     name = "cassandra-driver-3.6.0";