diff --git a/spacy/attrs.pxd b/spacy/attrs.pxd
index 2c3e2849d..d2ace1cff 100644
--- a/spacy/attrs.pxd
+++ b/spacy/attrs.pxd
@@ -14,7 +14,7 @@ cpdef enum attr_id_t:
     IS_STOP
     IS_OOV
     
-    FLAG13
+    FLAG13 = 13
     FLAG14
     FLAG15
     FLAG16