diff --git a/src/pretix/control/templates/pretixcontrol/base.html b/src/pretix/control/templates/pretixcontrol/base.html
index 2c1023677..159c15dfd 100644
--- a/src/pretix/control/templates/pretixcontrol/base.html
+++ b/src/pretix/control/templates/pretixcontrol/base.html
@@ -15,10 +15,9 @@
             <link rel="stylesheet" type="text/x-scss" href="{% static "lightbox/css/lightbox.scss" %}" />
 		{% endcompress %}
         {% if DEBUG %}
-            <script type="text/javascript" src="{% url 'javascript-catalog' lang=request.LANGUAGE_CODE %}"
-                    defer></script>
+            <script type="text/javascript" src="{% url 'javascript-catalog' lang=request.LANGUAGE_CODE %}"></script>
         {% else %}
-            <script src="{% statici18n request.LANGUAGE_CODE %}" async></script>
+            <script src="{% statici18n request.LANGUAGE_CODE %}"></script>
         {% endif %}
 		{% compress js %}
             <script type="text/javascript" src="{% static "jquery/js/jquery-2.1.1.min.js" %}"></script>
diff --git a/src/pretix/presale/templates/pretixpresale/base.html b/src/pretix/presale/templates/pretixpresale/base.html
index affa3d21c..5575e978d 100644
--- a/src/pretix/presale/templates/pretixpresale/base.html
+++ b/src/pretix/presale/templates/pretixpresale/base.html
@@ -73,9 +73,9 @@
 </div>
 {% include "pretixpresale/fragment_modals.html" %}
 {% if DEBUG %}
-    <script type="text/javascript" src="{% url 'javascript-catalog' lang=request.LANGUAGE_CODE %}" async></script>
+    <script type="text/javascript" src="{% url 'javascript-catalog' lang=request.LANGUAGE_CODE %}"></script>
 {% else %}
-    <script src="{% statici18n request.LANGUAGE_CODE %}" async></script>
+    <script src="{% statici18n request.LANGUAGE_CODE %}"></script>
 {% endif %}
 {% if request.session.iframe_session %}
     {% compress js %}