diff --git a/phpBB/adm/style/acp_main.html b/phpBB/adm/style/acp_main.html
index 8ae4f0721c..95420bdb61 100644
--- a/phpBB/adm/style/acp_main.html
+++ b/phpBB/adm/style/acp_main.html
@@ -24,7 +24,7 @@
 			<p>{{ VERSIONCHECK_FAIL_REASON }}</p>
 			<p><a href="{{ U_VERSIONCHECK_FORCE }}">{{ lang('VERSIONCHECK_FORCE_UPDATE') }}</a> &middot; <a href="{{ U_VERSIONCHECK }}">{{ lang('MORE_INFORMATION') }}</a></p>
 		</div>
-	{% elseif !S_VERSION_UP_TO_DATE %}
+	{% elseif not S_VERSION_UP_TO_DATE %}
 		<div class="errorbox">
 			<p>{{ lang('VERSION_NOT_UP_TO_DATE_TITLE') }}</p>
 			<p><a href="{{ U_VERSIONCHECK_FORCE }}">{{ lang('VERSIONCHECK_FORCE_UPDATE') }}</a> &middot; <a href="{{ U_VERSIONCHECK }}">{{ lang('MORE_INFORMATION') }}</a></p>