diff --git a/mapping.js b/mapping.js
index a9e3f61..067966d 100644
--- a/mapping.js
+++ b/mapping.js
@@ -121,7 +121,7 @@
       //var ovlLayers  = {};
       var item = desc.split("\\n")[0];
       var url1 = desc.match(/\[\[(.+)\]\]/g)[0];
-      var url = url1.substr(2, str.indexOf(']'));
+      var url = url1.substr(2, url.indexOf(']'));
       marker = L.marker([latNum, lngNum], {
         icon: L.divIcon({
           //html: '<a class="marker">あ</a>',