diff --git a/lib/assets/javascripts/turbograft/link.js b/lib/assets/javascripts/turbograft/link.js
index bbcc288..6bcf906 100644
--- a/lib/assets/javascripts/turbograft/link.js
+++ b/lib/assets/javascripts/turbograft/link.js
@@ -3,7 +3,9 @@
 * to use in determining whether it should process the link when clicked.
 */
 window.Link = class Link extends ComponentUrl {
-    HTML_EXTENSIONS = ['html'];
+    static initClass() {
+      this.HTML_EXTENSIONS = ['html'];
+    }
 
     static allowExtensions() {
       var extension, extensions, i, len;
@@ -53,3 +55,4 @@ window.Link = class Link extends ComponentUrl {
       return this.link.target.length !== 0;
     };
 };
+window.Link.initClass();