diff --git a/pkgs/development/python-modules/mypy/extensions.nix b/pkgs/development/python-modules/mypy/extensions.nix
index 5992a6815d8e..e62fa4230fff 100644
--- a/pkgs/development/python-modules/mypy/extensions.nix
+++ b/pkgs/development/python-modules/mypy/extensions.nix
@@ -13,12 +13,12 @@ buildPythonPackage rec {
     sha256 = "2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8";
   };
 
-  propagatedBuildInputs = if pythonOlder "3.5" then [ typing ] else [ ];
+  propagatedBuildInputs = lib.optional (pythonOlder "3.5") typing;
 
   meta = with lib; {
     description = "Experimental type system extensions for programs checked with the mypy typechecker";
-    homepage    = "http://www.mypy-lang.org";
-    license     = licenses.mit;
-    maintainers = with maintainers; [ martingms lnl7 ];
+    homepage = "http://www.mypy-lang.org";
+    license = licenses.mit;
+    maintainers = with maintainers; [ martingms lnl7 SuperSandro2000 ];
   };
 }