diff --git a/spacy/structs.pxd b/spacy/structs.pxd
index f3095df51..f150fa312 100644
--- a/spacy/structs.pxd
+++ b/spacy/structs.pxd
@@ -1,4 +1,4 @@
-from libc.stdint cimport uint8_t, uint32_t, int32_t
+from libc.stdint cimport uint8_t, uint32_t, int32_t, uint64_t
 
 from .typedefs cimport flags_t, attr_t, hash_t
 from .parts_of_speech cimport univ_pos_t
@@ -25,21 +25,16 @@ cdef struct LexemeC:
     float sentiment
     float l2_norm
 
-
-cdef struct Morphology:
-    uint8_t number
-    uint8_t tenspect # Tense/aspect/voice
-    uint8_t mood
-    uint8_t gender
-    uint8_t person
-    uint8_t case
-    uint8_t misc
+cdef struct MorphFeatC:
+    int name
+    int value
 
 
-cdef struct PosTag:
-    Morphology morph
-    int id
+cdef struct MorphologyC:
+    uint64_t[4] feature_set
+    MorphFeatC* features
     univ_pos_t pos
+    int n
 
 
 cdef struct Entity:
@@ -59,7 +54,7 @@ cdef struct Constituent:
 
 cdef struct TokenC:
     const LexemeC* lex
-    Morphology morph
+    const MorphologyC* morph
     const Constituent* ctnt
     univ_pos_t pos
     bint spacy