diff --git a/spacy/structs.pxd b/spacy/structs.pxd
index a0a3d65a3..04078c0f5 100644
--- a/spacy/structs.pxd
+++ b/spacy/structs.pxd
@@ -5,7 +5,7 @@ from .parts_of_speech cimport univ_pos_t
 
 
 cdef struct LexemeC:
-    const float* repvec
+    float* repvec
 
     flags_t flags