diff --git a/src/hb-coretext.cc b/src/hb-coretext.cc
index 04c5c5c0f..90c6653d0 100644
--- a/src/hb-coretext.cc
+++ b/src/hb-coretext.cc
@@ -230,7 +230,7 @@ hb_coretext_face_get_cg_font (hb_face_t *face)
 struct hb_coretext_shaper_font_data_t {};
 
 hb_coretext_shaper_font_data_t *
-_hb_coretext_shaper_font_data_create (hb_font_t *font)
+_hb_coretext_shaper_font_data_create (hb_font_t *font HB_UNUSED)
 {
   return (hb_coretext_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
 }
diff --git a/src/hb-ot-shape.cc b/src/hb-ot-shape.cc
index 44653d578..015707da2 100644
--- a/src/hb-ot-shape.cc
+++ b/src/hb-ot-shape.cc
@@ -145,7 +145,7 @@ _hb_ot_shaper_face_data_destroy (hb_ot_shaper_face_data_t *data)
 struct hb_ot_shaper_font_data_t {};
 
 hb_ot_shaper_font_data_t *
-_hb_ot_shaper_font_data_create (hb_font_t *font)
+_hb_ot_shaper_font_data_create (hb_font_t *font HB_UNUSED)
 {
   return (hb_ot_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
 }