diff --git a/pkgs/development/python-modules/safe/default.nix b/pkgs/development/python-modules/safe/default.nix
new file mode 100644
index 000000000000..f7f6f7eabf91
--- /dev/null
+++ b/pkgs/development/python-modules/safe/default.nix
@@ -0,0 +1,24 @@
+{ stdenv
+, buildPythonPackage
+, fetchPypi
+, nose
+}:
+
+buildPythonPackage rec {
+  version = "0.4";
+  pname = "Safe";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "a2fdac9fe8a9dcf02b438201d6ce0b7be78f85dc6492d03edfb89be2adf489de";
+  };
+
+  buildInputs = [ nose ];
+
+  meta = with stdenv.lib; {
+    homepage = "https://github.com/lepture/safe";
+    license = licenses.bsd3;
+    description = "Check password strength";
+  };
+
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 79f8900f76b3..a01278025794 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -2145,22 +2145,7 @@ in {
 
   joblib = callPackage ../development/python-modules/joblib { };
 
-  safe = buildPythonPackage rec {
-    version = "0.4";
-    name = "Safe-${version}";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/S/Safe/${name}.tar.gz";
-      sha256 = "a2fdac9fe8a9dcf02b438201d6ce0b7be78f85dc6492d03edfb89be2adf489de";
-    };
-
-    buildInputs = with self; [ nose ];
-    meta = {
-      homepage = "https://github.com/lepture/safe";
-      license = licenses.bsd3;
-      description = "Check password strength";
-    };
-  };
+  safe = callPackage ../development/python-modules/safe { };
 
   samplerate = buildPythonPackage rec {
     name = "scikits.samplerate-${version}";