diff --git a/pkgs/development/python-modules/python-jose/default.nix b/pkgs/development/python-modules/python-jose/default.nix
index 14daecab4db..4eb2daaf26d 100644
--- a/pkgs/development/python-modules/python-jose/default.nix
+++ b/pkgs/development/python-modules/python-jose/default.nix
@@ -25,11 +25,6 @@ buildPythonPackage rec {
     py.test
   '';
 
-  postPatch = ''
-    # File says it's utf-8 so instead of relying on the environment, fix the decoding when reading.
-    substituteInPlace setup.py --replace "open('README.md')" "open('README.md',encoding='utf-8')"
-  '';
-
   propagatedBuildInputs = [ future six ecdsa rsa ];
 
   meta = with stdenv.lib; {