diff --git a/contrib/site_description/main.php b/contrib/site_description/main.php
index 636d482c..d76117fb 100644
--- a/contrib/site_description/main.php
+++ b/contrib/site_description/main.php
@@ -9,12 +9,12 @@
 class SiteDescription implements Extension {
 	public function receive_event(Event $event) {
 		if($event instanceof PageRequestEvent) {
-			global $config;
-			if(strlen($config->get_string("site_description")) > 0) {
-				$description = $config->get_string("site_description");
-				$event->page->add_header("<meta name=\"description\" content=\"$description\">");
+			if(strlen($event->context->config->get_string("site_description")) > 0) {
+				$description = $event->context->config->get_string("site_description");
+				$event->context->page->add_header("<meta name=\"description\" content=\"$description\">");
 			}
 		}
+
 		if($event instanceof SetupBuildingEvent) {
 			$sb = new SetupBlock("Site Description");
 			$sb->add_longtext_option("site_description");