diff --git a/404.md b/404.md
index bed3f06ec1..38e738e198 100644
--- a/404.md
+++ b/404.md
@@ -10,12 +10,14 @@ $( document ).ready(function() {
   var doRedirect=false;
   var forwardingURL=window.location.href;
   for (i=0;i<oldURLs.length;i++) {
-    if (window.location.href.indexOf(oldURLs[i])) > -1) {
+    if (forwardingURL.indexOf(oldURLs[i]) > -1) {
       doRedirect=true;
       forwardingURL=forwardingURL.replace(oldURLs[i],"");
     }
   }
-  if (doRedirect) window.location.replace(forwardingURL);
+  if (doRedirect) {
+    window.location.replace(forwardingURL);
+  };
 }
 });
 </script>