diff --git a/spacy/morphology.pxd b/spacy/morphology.pxd
index be6711bfd..9192f351f 100644
--- a/spacy/morphology.pxd
+++ b/spacy/morphology.pxd
@@ -44,7 +44,7 @@ cdef class Morphology:
     cdef int assign_feature(self, uint64_t* morph, univ_morph_t feat_id, bint value) except -1
 
 
-cpdef enum univ_morph_t:
+cdef enum univ_morph_t:
     NIL = 0
     Animacy_anim = symbols.Animacy_anim
     Animacy_inam