diff --git a/core/mui/cairo_markup_generator.rb b/core/mui/cairo_markup_generator.rb
index c8e62be..937647b 100644
--- a/core/mui/cairo_markup_generator.rb
+++ b/core/mui/cairo_markup_generator.rb
@@ -27,11 +27,16 @@ module Pango
 =end
 
 module Gdk::MarkupGenerator
+  # :nodoc:
+  memoize def score
+    Plugin[:gtk].score_of(message)
+  end
+
   # 表示する際に本文に適用すべき装飾オブジェクトを作成する
   # ==== Return
   # Pango::AttrList 本文に適用する装飾
   def description_attr_list(attr_list=Pango::AttrList.new, emoji_height: 24)
-    Plugin[:gtk].score_of(message).inject(0){|start_index, note|
+    score.inject(0){|start_index, note|
       end_index = start_index + note.description.bytesize
       if note.respond_to?(:inline_photo)
         end_index += -note.description.bytesize + 1
diff --git a/core/mui/cairo_miracle_painter.rb b/core/mui/cairo_miracle_painter.rb
index 9e7049f..b6c130c 100644
--- a/core/mui/cairo_miracle_painter.rb
+++ b/core/mui/cairo_miracle_painter.rb
@@ -44,11 +44,6 @@ class Gdk::MiraclePainter < Gtk::Object
     message end
   deprecate :to_message, :none, 2017, 5
 
-  # :nodoc:
-  memoize def score
-    Plugin[:gtk].score_of(message)
-  end
-
   # @@miracle_painters = Hash.new
 
   # _message_ を内部に持っているGdk::MiraclePainterの集合をSetで返す。