diff --git a/spacy/lexeme.pyx b/spacy/lexeme.pyx
index 1df516dcb..8042098d7 100644
--- a/spacy/lexeme.pyx
+++ b/spacy/lexeme.pyx
@@ -349,7 +349,7 @@ cdef class Lexeme:
     @property
     def is_oov(self):
         """RETURNS (bool): Whether the lexeme is out-of-vocabulary."""
-        return self.orth in self.vocab.vectors
+        return self.orth not in self.vocab.vectors
 
     property is_stop:
         """RETURNS (bool): Whether the lexeme is a stop word."""
diff --git a/spacy/tests/vocab_vectors/test_vectors.py b/spacy/tests/vocab_vectors/test_vectors.py
index 576ca93d2..b31cef1f2 100644
--- a/spacy/tests/vocab_vectors/test_vectors.py
+++ b/spacy/tests/vocab_vectors/test_vectors.py
@@ -376,6 +376,6 @@ def test_vector_is_oov():
     data[1] = 2.0
     vocab.set_vector("cat", data[0])
     vocab.set_vector("dog", data[1])
-    assert vocab["cat"].is_oov is True
-    assert vocab["dog"].is_oov is True
-    assert vocab["hamster"].is_oov is False
+    assert vocab["cat"].is_oov is False
+    assert vocab["dog"].is_oov is False
+    assert vocab["hamster"].is_oov is True
diff --git a/spacy/tokens/token.pyx b/spacy/tokens/token.pyx
index 45deebc93..8d3406bae 100644
--- a/spacy/tokens/token.pyx
+++ b/spacy/tokens/token.pyx
@@ -923,7 +923,7 @@ cdef class Token:
     @property
     def is_oov(self):
         """RETURNS (bool): Whether the token is out-of-vocabulary."""
-        return self.c.lex.orth in self.vocab.vectors
+        return self.c.lex.orth not in self.vocab.vectors
 
     @property
     def is_stop(self):