diff --git a/spacy/syntax/ner.pyx b/spacy/syntax/ner.pyx
index a476f4546..55cba692f 100644
--- a/spacy/syntax/ner.pyx
+++ b/spacy/syntax/ner.pyx
@@ -54,15 +54,6 @@ cdef class BiluoPushDown(TransitionSystem):
     def __init__(self, *args, **kwargs):
         TransitionSystem.__init__(self, *args, **kwargs)
 
-    def __reduce__(self):
-        labels_by_action = OrderedDict()
-        cdef Transition t
-        for trans in self.c[:self.n_moves]:
-            label_str = self.strings[trans.label]
-            labels_by_action.setdefault(trans.move, []).append(label_str)
-        return (BiluoPushDown, (self.strings, labels_by_action),
-                None, None)
-
     @classmethod
     def get_actions(cls, **kwargs):
         actions = {