diff --git a/spacy/tests/regression/test_issue1807.py b/spacy/tests/regression/test_issue1807.py
new file mode 100644
index 000000000..c73f008eb
--- /dev/null
+++ b/spacy/tests/regression/test_issue1807.py
@@ -0,0 +1,14 @@
+'''Test vocab.set_vector also adds the word to the vocab.'''
+from __future__ import unicode_literals
+from ...vocab import Vocab
+
+import numpy 
+
+
+def test_issue1807():
+    vocab = Vocab()
+    arr = numpy.ones((50,), dtype='f')
+    assert 'hello' not in vocab
+    vocab.set_vector('hello', arr)
+    assert 'hello' in vocab
+
diff --git a/spacy/vocab.pyx b/spacy/vocab.pyx
index 34ad4eb67..a103bcd0e 100644
--- a/spacy/vocab.pyx
+++ b/spacy/vocab.pyx
@@ -335,6 +335,7 @@ cdef class Vocab:
             else:
                 width = self.vectors.shape[1]
             self.vectors.resize((new_rows, width))
+            lex = self[orth] # Adds worse to vocab
             self.vectors.add(orth, vector=vector)
         self.vectors.add(orth, vector=vector)