diff --git a/templates/site-logo-fragment.html b/templates/site-logo-fragment.html
index 9a170ea..f2099fc 100644
--- a/templates/site-logo-fragment.html
+++ b/templates/site-logo-fragment.html
@@ -1,7 +1,7 @@
 {% if request.in_contest_mode and request.participation.contest.logo_override_image %}
-    <img src="{{ request.participation.contest.logo_override_image|camo }}" alt="{{ SITE_NAME }}" height="44" style="border: none">
+    <img data-src="{{ request.participation.contest.logo_override_image|camo }}" alt="{{ SITE_NAME }}" height="44" style="border: none">
 {% elif logo_override_image is defined and logo_override_image %}
-    <img src="{{ logo_override_image|camo }}" alt="{{ SITE_NAME }}" height="44" style="border: none">
+    <img data-src="{{ logo_override_image|camo }}" alt="{{ SITE_NAME }}" height="44" style="border: none">
 {% else %}
     <img src="{{ static('icons/logo.png') }}" alt="{{ SITE_NAME }}" height="44"
          onerror="this.src=&quot;{{ static('icons/logo.png') }}&quot;; this.onerror=null" style="border: none">