diff --git a/pkgs/development/python-modules/colanderalchemy/default.nix b/pkgs/development/python-modules/colanderalchemy/default.nix
new file mode 100644
index 000000000000..78f0f6fe371f
--- /dev/null
+++ b/pkgs/development/python-modules/colanderalchemy/default.nix
@@ -0,0 +1,35 @@
+{ stdenv
+, buildPythonPackage
+, fetchpatch
+, fetchPypi
+, unittest2
+, colander
+, sqlalchemy
+}:
+
+buildPythonPackage rec {
+  pname = "ColanderAlchemy";
+  version = "0.3.3";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "11wcni2xmfmy001rj62q2pwf305vvngkrfm5c4zlwvgbvlsrvnnw";
+  };
+
+  patches = [
+    (fetchpatch {
+        url = "https://github.com/stefanofontanelli/ColanderAlchemy/commit/b45fe35f2936a5ccb705e9344075191e550af6c9.patch";
+        sha256 = "1kf278wjq49zd6fhpp55vdcawzdd107767shzfck522sv8gr6qvx";
+    })
+  ];
+
+  buildInputs = [ unittest2 ];
+  propagatedBuildInputs = [ colander sqlalchemy ];
+
+  meta = with stdenv.lib; {
+    description = "Autogenerate Colander schemas based on SQLAlchemy models";
+    homepage = https://github.com/stefanofontanelli/ColanderAlchemy;
+    license = licenses.mit;
+  };
+
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 481b8d5ed5eb..c9977ca48cd0 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1343,31 +1343,7 @@ in {
   # Backported version of the ConfigParser library of Python 3.3
   configparser = callPackage ../development/python-modules/configparser { };
 
-  ColanderAlchemy = buildPythonPackage rec {
-    name = "ColanderAlchemy-${version}";
-    version = "0.3.3";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/C/ColanderAlchemy/${name}.tar.gz";
-      sha256 = "11wcni2xmfmy001rj62q2pwf305vvngkrfm5c4zlwvgbvlsrvnnw";
-    };
-
-    patches = [
-      (pkgs.fetchpatch {
-          url = "https://github.com/stefanofontanelli/ColanderAlchemy/commit/b45fe35f2936a5ccb705e9344075191e550af6c9.patch";
-          sha256 = "1kf278wjq49zd6fhpp55vdcawzdd107767shzfck522sv8gr6qvx";
-      })
-    ];
-
-    buildInputs = with self; [ unittest2 ];
-    propagatedBuildInputs = with self; [ colander sqlalchemy ];
-
-    meta = {
-      description = "Autogenerate Colander schemas based on SQLAlchemy models";
-      homepage = https://github.com/stefanofontanelli/ColanderAlchemy;
-      license = licenses.mit;
-    };
-  };
+  ColanderAlchemy = callPackage ../development/python-modules/colanderalchemy { };
 
   conda = callPackage ../development/python-modules/conda { };