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-rw-r--r--pkgs/development/python-modules/monty/default.nix7
1 files changed, 7 insertions, 0 deletions
diff --git a/pkgs/development/python-modules/monty/default.nix b/pkgs/development/python-modules/monty/default.nix
index 427f0af4573..fb84847acff 100644
--- a/pkgs/development/python-modules/monty/default.nix
+++ b/pkgs/development/python-modules/monty/default.nix
@@ -29,6 +29,13 @@ buildPythonPackage rec {
   checkInputs = [ lsof nose numpy msgpack coverage coveralls pymongo];
   propagatedBuildInputs = [ six ruamel_yaml ];
 
+  # test suite tries to decode bytes, but msgpack now returns a str
+  # https://github.com/materialsvirtuallab/monty/pull/121
+  postPatch = ''
+    substituteInPlace tests/test_serialization.py \
+      --replace ".decode('utf-8')" ""
+  '';
+
   preCheck = ''
     substituteInPlace tests/test_os.py \
       --replace 'self.assertEqual("/usr/bin/find", which("/usr/bin/find"))' '#'