diff --git a/spacy/syntax/parser.pyx b/spacy/syntax/parser.pyx
index c5453057f..6cfa57c60 100644
--- a/spacy/syntax/parser.pyx
+++ b/spacy/syntax/parser.pyx
@@ -141,6 +141,7 @@ cdef class Parser:
         for i in range(batch_size):
             self.parseC(doc_ptr[i], lengths[i], nr_feat, nr_class)
             for doc in queue:
+                doc.is_parsed = True
                 yield doc
         PyErr_CheckSignals()