diff --git a/source/javascripts/casper.js b/source/javascripts/casper.js
index 87b859c..991c839 100644
--- a/source/javascripts/casper.js
+++ b/source/javascripts/casper.js
@@ -1,5 +1,5 @@
 (function() {
-  document.addEventListener('DOMContentLoaded', function() {
+  (function() {
     document.querySelectorAll('.menu-button, .nav-cover, .nav-close').forEach(function(element) {
       element.addEventListener('click', function(event) {
         event.preventDefault();
@@ -12,7 +12,7 @@
         document.body.className = body_classes.join(' ');
       });
     });
-  }, false);
+  })();
 
   // slightly adapted from http://stackoverflow.com/a/26798337/421705
   window.requestAnimFrame = (function(){
@@ -74,7 +74,7 @@
     tick();
   }
 
-  document.addEventListener('DOMContentLoaded', function() {
+  (function() {
     document.querySelectorAll('.scroll-down').forEach(function(element) {
       element.addEventListener('click', function(event) {
         event.preventDefault();
@@ -97,5 +97,5 @@
         }
       });
     });
-  }, false);
+  })();
 })();
diff --git a/source/javascripts/obfuscate.js b/source/javascripts/obfuscate.js
index 44ce499..86b22d0 100644
--- a/source/javascripts/obfuscate.js
+++ b/source/javascripts/obfuscate.js
@@ -16,7 +16,7 @@
     return buf.join('');
   };
 
-  document.addEventListener("DOMContentLoaded", function() {
+  (function() {
     var elements = document.getElementsByClassName("hidden-email");
     Array.prototype.forEach.call(elements, function(element){
       var encoded = element.getAttribute("data-email");
@@ -29,5 +29,5 @@
       var link = "<" + "a h" + "ref=\"mai" + "lto:" + decoded + "\">" + decoded + "</" + "a>";
       element.innerHTML = link;
     });
-  }, false);
+  })();
 })();
diff --git a/source/layouts/layout.haml b/source/layouts/layout.haml
index 862a52d..730738f 100644
--- a/source/layouts/layout.haml
+++ b/source/layouts/layout.haml
@@ -59,4 +59,4 @@
           - if current_page.data.cover_license.present?
             = '| ' + markdown(current_page.data.cover_license)
 
-    = javascript_include_tag :application
+    = javascript_include_tag :application, async: true