diff --git a/spacy/tokens/token.pyx b/spacy/tokens/token.pyx
index 8099abd92..322c9a54c 100644
--- a/spacy/tokens/token.pyx
+++ b/spacy/tokens/token.pyx
@@ -223,7 +223,7 @@ cdef class Token:
 
     def set_morph(self, features):
         cdef hash_t key
-        if features is 0:
+        if features is None:
             self.c.morph = 0
         else:
             if isinstance(features, int):