diff --git a/phpBB/adm/style/acp_attachments.html b/phpBB/adm/style/acp_attachments.html
index ad8ee8ef10..2cba5774f6 100644
--- a/phpBB/adm/style/acp_attachments.html
+++ b/phpBB/adm/style/acp_attachments.html
@@ -51,7 +51,7 @@
 				<dt><label for="{options.KEY}">{options.TITLE}{L_COLON}</label><!-- IF options.S_EXPLAIN --><br /><span>{options.TITLE_EXPLAIN}</span><!-- ENDIF --></dt>
 				<dd>{options.CONTENT}</dd>
 				{% if (options.KEY == 'allow_attachments' and S_EMPTY_POST_GROUPS) or (options.KEY == 'allow_pm_attach' and S_EMPTY_PM_GROUPS) %}
-					<dd><div class="warningbox">{{ lang(options.KEY == 'allow_attachments' ? 'NO_EXT_GROUP_ALLOWED_POST' : 'NO_EXT_GROUP_ALLOWED_PM', U_EXTENSION_GROUPS) }}</div></dd>
+					<dd><span class="error">{{ lang(options.KEY == 'allow_attachments' ? 'NO_EXT_GROUP_ALLOWED_POST' : 'NO_EXT_GROUP_ALLOWED_PM', U_EXTENSION_GROUPS) }}</span></dd>
 				{% endif %}
 			</dl>