diff --git a/spacy/syntax/iterators.pyx b/spacy/syntax/iterators.pyx
index c2003a28c..9ceb0c0bf 100644
--- a/spacy/syntax/iterators.pyx
+++ b/spacy/syntax/iterators.pyx
@@ -7,8 +7,7 @@ def english_noun_chunks(doc):
     np_deps = [doc.vocab.strings[label] for label in labels]
     conj = doc.vocab.strings['conj']
     np_label = doc.vocab.strings['NP']
-    for i in range(len(doc)):
-        word = doc[i]
+    for i, word in enumerate(doc):
         if word.pos in (NOUN, PROPN, PRON) and word.dep in np_deps:
             yield word.left_edge.i, word.i+1, np_label
         elif word.pos == NOUN and word.dep == conj: