diff --git a/phpBB/styles/prosilver/template/viewtopic_topic_tools.html b/phpBB/styles/prosilver/template/viewtopic_topic_tools.html
index 78dbae2dd4..9ae83b9486 100644
--- a/phpBB/styles/prosilver/template/viewtopic_topic_tools.html
+++ b/phpBB/styles/prosilver/template/viewtopic_topic_tools.html
@@ -10,8 +10,8 @@
 				<!-- EVENT viewtopic_topic_tools_before -->
 				{% if U_WATCH_TOPIC %}
 					<li>
-						<a href="{{ U_WATCH_TOPIC }}" class="watch-topic-link" title="{{ S_WATCH_TOPIC_TITLE }}" data-ajax="toggle_link" data-toggle-class="icon fa-{{ !S_WATCHING_TOPIC ? 'check-' }}square-o fa-fw" data-toggle-text="{{ S_WATCH_TOPIC_TOGGLE }}" data-toggle-url="{{ U_WATCH_TOPIC_TOGGLE }}" data-update-all=".watch-topic-link">
-							<i class="icon fa-{{ S_WATCHING_TOPIC ? 'check-' }}square-o fa-fw" aria-hidden="true"></i><span>{{ S_WATCH_TOPIC_TITLE }}</span>
+						<a href="{{ U_WATCH_TOPIC }}" class="watch-topic-link" title="{{ S_WATCH_TOPIC_TITLE }}" data-ajax="toggle_link" data-toggle-class="icon {{ !S_WATCHING_TOPIC ? 'fa-check-square-o' : 'fa-square-o' }} fa-fw" data-toggle-text="{{ S_WATCH_TOPIC_TOGGLE }}" data-toggle-url="{{ U_WATCH_TOPIC_TOGGLE }}" data-update-all=".watch-topic-link">
+							<i class="icon {{ S_WATCHING_TOPIC ? 'fa-check-square-o' : 'fa-square-o' }} fa-fw" aria-hidden="true"></i><span>{{ S_WATCH_TOPIC_TITLE }}</span>
 						</a>
 					</li>
 				{% endif %}