diff --git a/pkgs/development/python-modules/zope_size/default.nix b/pkgs/development/python-modules/zope_size/default.nix
new file mode 100644
index 00000000000..8be9a04ae3f
--- /dev/null
+++ b/pkgs/development/python-modules/zope_size/default.nix
@@ -0,0 +1,26 @@
+{ stdenv
+, buildPythonPackage
+, fetchPypi
+, zope_i18nmessageid
+, zope_interface
+}:
+
+buildPythonPackage rec {
+  pname = "zope.size";
+  version = "3.5.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "006xfkhvmypwd3ww9gbba4zly7n9w30bpp1h74d53la7l7fiqk2f";
+  };
+
+  propagatedBuildInputs = [ zope_i18nmessageid zope_interface ];
+
+  meta = with stdenv.lib; {
+    homepage = http://github.com/zopefoundation/zope.size;
+    description = "Interfaces and simple adapter that give the size of an object";
+    license = licenses.zpl20;
+    maintainers = with maintainers; [ goibhniu ];
+  };
+
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index f7d63feaef4..f93072a80a9 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -4212,21 +4212,7 @@ in {
 
   zope_schema = callPackage ../development/python-modules/zope_schema { };
 
-  zope_size = buildPythonPackage rec {
-    name = "zope.size-3.5.0";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/z/zope.size/${name}.tar.gz";
-      sha256 = "006xfkhvmypwd3ww9gbba4zly7n9w30bpp1h74d53la7l7fiqk2f";
-    };
-
-    propagatedBuildInputs = with self; [ zope_i18nmessageid zope_interface ];
-
-    meta = {
-        maintainers = with maintainers; [ goibhniu ];
-    };
-  };
-
+  zope_size = callPackage ../development/python-modules/zope_size { };
 
   zope_testing = buildPythonPackage rec {
     name = "zope.testing-${version}";