diff --git a/pkgs/development/python-modules/flask/default.nix b/pkgs/development/python-modules/flask/default.nix
new file mode 100644
index 000000000000..b16dc08a5e16
--- /dev/null
+++ b/pkgs/development/python-modules/flask/default.nix
@@ -0,0 +1,21 @@
+{ stdenv, buildPythonPackage, fetchPypi
+, itsdangerous, click, werkzeug, jinja2 }:
+
+buildPythonPackage rec {
+  name = "${pname}-${version}";
+  version = "0.12.2";
+  pname = "Flask";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1hfs2jr2m5lr51xd4gblb28rncd0xrpycz6c07cyqsbv4dhl9x29";
+  };
+
+  propagatedBuildInputs = [ itsdangerous click werkzeug jinja2 ];
+
+  meta = with stdenv.lib; {
+    homepage = http://flask.pocoo.org/;
+    description = "A microframework based on Werkzeug, Jinja 2, and good intentions";
+    license = licenses.bsd3;
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index ab90dfd5e012..5da7d551e5c4 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -9551,22 +9551,7 @@ in {
     };
   };
 
-  flask = buildPythonPackage {
-    name = "flask-0.12";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/F/Flask/Flask-0.12.tar.gz";
-      sha256 = "12yasybryp33rdchsqgckf15zj4pjfam7ly5spmn2sijpv6h7s4k";
-    };
-
-    propagatedBuildInputs = with self; [ itsdangerous click werkzeug jinja2 ];
-
-    meta = {
-      homepage = http://flask.pocoo.org/;
-      description = "A microframework based on Werkzeug, Jinja 2, and good intentions";
-      license = licenses.bsd3;
-    };
-  };
+  flask = callPackage ../development/python-modules/flask { };
 
   flask_assets = buildPythonPackage rec {
     name = "Flask-Assets-${version}";