diff --git a/src/hb-ot-color.cc b/src/hb-ot-color.cc
index c89dc9e54..b38e67c45 100644
--- a/src/hb-ot-color.cc
+++ b/src/hb-ot-color.cc
@@ -320,7 +320,7 @@ hb_ot_color_glyph_reference_png (hb_font_t *font, hb_codepoint_t  glyph)
   if (_get_sbix (font->face).has_data ())
     blob = _get_sbix (font->face).reference_png (font, glyph, nullptr, nullptr);
 
-  if (hb_blob_get_length (blob) == 0 && _get_cbdt (font->face).has_data ())
+  if (!blob->length && _get_cbdt (font->face).has_data ())
     blob = _get_cbdt (font->face).reference_png (glyph, font->x_ppem, font->y_ppem);
 
   return blob;