diff --git a/templates/thread.html b/templates/thread.html
index 0a78f274..61b6e152 100644
--- a/templates/thread.html
+++ b/templates/thread.html
@@ -13,7 +13,7 @@
 <body class="8chan {% if mod %}is-moderator{% else %}is-not-moderator{% endif %}" data-stylesheet="{% if config.default_stylesheet.1 != '' and not mod %}{{ config.default_stylesheet.1 }}{% else %}default{% endif %}">
 	{{ boardlist.top }}
 	{% if pm %}<div class="top_notice">You have <a href="?/PM/{{ pm.id }}">an unread PM</a>{% if pm.waiting > 0 %}, plus {{ pm.waiting }} more waiting{% endif %}.</div><hr />{% endif %}
-	{% if config.url_banner %}<img class="board_image" src="{{ config.url_banner }}?board={{ board.uri }}" {% if config.banner_width or config.banner_height %}style="{% if config.banner_width %}width:{{ config.banner_width }}px{% endif %};{% if config.banner_width %}height:{{ config.banner_height }}px{% endif %}" {% endif %}alt="" />{% endif %}
+	{% if config.url_banner %}<img class="board_image" src="{{ config.url_banner }}?board={{ board.uri|url_encode }}" {% if config.banner_width or config.banner_height %}style="{% if config.banner_width %}width:{{ config.banner_width }}px{% endif %};{% if config.banner_width %}height:{{ config.banner_height }}px{% endif %}" {% endif %}alt="" />{% endif %}
 	<header>
 		<h1>{{ board.url }} - {{ board.title|e }}</h1>
 		<div class="subtitle">
