diff --git a/spacy/vocab.pxd b/spacy/vocab.pxd
index 9c951b2b7..52f6d1c70 100644
--- a/spacy/vocab.pxd
+++ b/spacy/vocab.pxd
@@ -32,7 +32,7 @@ cdef class Vocab:
     cdef public object writing_system
     cdef public object get_noun_chunks
     cdef readonly int length
-    cdef public object _unused_object # TODO remove in v4, see #9150
+    cdef public object _unused_object  # TODO remove in v4, see #9150
     cdef public object lex_attr_getters
     cdef public object cfg