diff --git a/src/hb-face.cc b/src/hb-face.cc
index 536559863..87a64e827 100644
--- a/src/hb-face.cc
+++ b/src/hb-face.cc
@@ -342,7 +342,7 @@ hb_face_set_user_data (hb_face_t          *face,
  * Since: 0.9.2
  **/
 void *
-hb_face_get_user_data (const hb_face_t    *face,
+hb_face_get_user_data (hb_face_t          *face,
 		       hb_user_data_key_t *key)
 {
   return hb_object_get_user_data (face, key);
diff --git a/src/hb-face.h b/src/hb-face.h
index 6ef2f8b88..3b7477a76 100644
--- a/src/hb-face.h
+++ b/src/hb-face.h
@@ -96,7 +96,7 @@ hb_face_set_user_data (hb_face_t          *face,
 		       hb_bool_t           replace);
 
 HB_EXTERN void *
-hb_face_get_user_data (const hb_face_t    *face,
+hb_face_get_user_data (hb_face_t          *face,
 		       hb_user_data_key_t *key);
 
 HB_EXTERN void