diff --git a/spacy/structs.pxd b/spacy/structs.pxd
index de0fe2167..733ce3022 100644
--- a/spacy/structs.pxd
+++ b/spacy/structs.pxd
@@ -32,18 +32,8 @@ cdef struct Entity:
     int label
 
 
-cdef struct Constituent:
-    const TokenC* head
-    const Constituent* parent
-    const Constituent* first
-    const Constituent* last
-    int label
-    int length
-
-
 cdef struct TokenC:
     const LexemeC* lex
-    const Constituent* ctnt
     uint64_t morph
     univ_pos_t pos
     bint spacy