--- mikutter/core/mui/cairo_miracle_painter.rb.orig	2014-05-08 23:43:47.000000000 +0900
+++ mikutter/core/mui/cairo_miracle_painter.rb	2014-05-13 19:45:03.000000000 +0900
@@ -381,7 +381,8 @@
       context.set_source_pixbuf(main_icon)
       context.paint
     }
-    render_icon_over_button(context)
+    if not (message.to_message.system?)
+      render_icon_over_button(context) end
   end
 
   def render_main_text(context)