diff --git a/pkgs/development/python-modules/rsa/default.nix b/pkgs/development/python-modules/rsa/default.nix
new file mode 100644
index 000000000000..82eedf70cb09
--- /dev/null
+++ b/pkgs/development/python-modules/rsa/default.nix
@@ -0,0 +1,26 @@
+{ stdenv
+, buildPythonPackage
+, fetchPypi
+, unittest2
+, pyasn1
+}:
+
+buildPythonPackage rec {
+  pname = "rsa";
+  version = "3.4.2";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1dcxvszbikgzh99ybdc7jq0zb9wspy2ds8z9mjsqiyv3q884xpr5";
+  };
+
+  nativeBuildInputs = [ unittest2 ];
+  propagatedBuildInputs = [ pyasn1 ];
+
+  meta = with stdenv.lib; {
+    homepage = https://stuvel.eu/rsa;
+    license = licenses.asl20;
+    description = "A pure-Python RSA implementation";
+  };
+
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 00ccb29469ea..b21c9141284e 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -3648,24 +3648,7 @@ in {
 
   rpyc = callPackage ../development/python-modules/rpyc { };
 
-  rsa = buildPythonPackage rec {
-    name = "rsa-${version}";
-    version = "3.4.2";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/r/rsa/${name}.tar.gz";
-      sha256 = "1dcxvszbikgzh99ybdc7jq0zb9wspy2ds8z9mjsqiyv3q884xpr5";
-    };
-
-    nativeBuildInputs = with self; [ unittest2 ];
-    propagatedBuildInputs = with self; [ pyasn1 ];
-
-    meta = {
-      homepage = https://stuvel.eu/rsa;
-      license = licenses.asl20;
-      description = "A pure-Python RSA implementation";
-    };
-  };
+  rsa = callPackage ../development/python-modules/rsa { };
 
   Rtree = callPackage ../development/python-modules/Rtree { inherit (pkgs) libspatialindex; };