diff --git a/spacy/kb/kb.pxd b/spacy/kb/kb.pxd
index 1b0a03838..263469546 100644
--- a/spacy/kb/kb.pxd
+++ b/spacy/kb/kb.pxd
@@ -5,6 +5,7 @@ from libc.stdint cimport int64_t
 
 from ..vocab cimport Vocab
 
+
 cdef class KnowledgeBase:
     cdef Pool mem
     cdef readonly Vocab vocab