diff --git a/_layouts/default.html b/_layouts/default.html
index 660028e..cea490f 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -11,7 +11,7 @@ layout: compress
 {% assign style = (style_scss | scssify) %}
 
 {% comment %}アイコンのURL{% endcomment %}
-{% assign icon_url = ({{ site.github.url }} | append: "/images/icon.png") %}
+{% assign icon_url = (site.github.url | append: "/images/icon.png") %}
 
 {% capture amp-boilerplate %}
 body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}