diff --git a/src/hb-subset-input.cc b/src/hb-subset-input.cc
index ba74d9294..0b2de43ee 100644
--- a/src/hb-subset-input.cc
+++ b/src/hb-subset-input.cc
@@ -543,7 +543,7 @@ hb_subset_preprocess (hb_face_t *source)
  *
  * Return value: (transfer none): pointer to the #hb_map_t of the custom glyphs ID map.
  *
- * Since: REPLACEME
+ * XSince: REPLACEME
  **/
 HB_EXTERN hb_map_t*
 hb_subset_input_old_to_new_glyph_mapping (hb_subset_input_t *input)
diff --git a/src/hb-subset.h b/src/hb-subset.h
index 078dc5abd..6368ff93f 100644
--- a/src/hb-subset.h
+++ b/src/hb-subset.h
@@ -154,6 +154,9 @@ hb_subset_input_glyph_set (hb_subset_input_t *input);
 HB_EXTERN hb_set_t *
 hb_subset_input_set (hb_subset_input_t *input, hb_subset_sets_t set_type);
 
+HB_EXTERN hb_map_t*
+hb_subset_input_old_to_new_glyph_mapping (hb_subset_input_t *input);
+
 HB_EXTERN hb_subset_flags_t
 hb_subset_input_get_flags (hb_subset_input_t *input);
 
@@ -172,9 +175,6 @@ hb_subset_input_pin_axis_location (hb_subset_input_t  *input,
 				   hb_tag_t            axis_tag,
 				   float               axis_value);
 
-HB_EXTERN hb_map_t*
-hb_subset_input_old_to_new_glyph_mapping (hb_subset_input_t *input);
-
 #ifdef HB_EXPERIMENTAL_API
 HB_EXTERN hb_bool_t
 hb_subset_input_override_name_table (hb_subset_input_t  *input,