diff --git a/dill/_dill.py b/dill/_dill.py
index b4887ce8..0869d766 100644
--- a/dill/_dill.py
+++ b/dill/_dill.py
@@ -2210,7 +2210,6 @@ def save_function(pickler, obj):
     if not _locate_function(obj, pickler):
         log.info("F1: %s" % obj)
         _recurse = getattr(pickler, '_recurse', None)
-        _byref = getattr(pickler, '_byref', None)
         _postproc = getattr(pickler, '_postproc', None)
         _main_modified = getattr(pickler, '_main_modified', None)
         _original_main = getattr(pickler, '_original_main', __builtin__)#'None'
diff --git a/tests/test_classdef.py b/tests/test_classdef.py
index 52323441..c6522ebc 100644
--- a/tests/test_classdef.py
+++ b/tests/test_classdef.py
@@ -228,6 +228,15 @@ def test_origbases():
     if sys.hexversion >= 0x03070000:
         assert dill.copy(customIntList).__orig_bases__ == customIntList.__orig_bases__
 
+def test_attr():
+    import attr
+    @attr.s
+    class A:
+        a = attr.ib()
+
+    v = A(1)
+    assert dill.copy(v) == v
+
 def test_metaclass():
     if dill._dill.PY3:
         class metaclass_with_new(type):