diff --git a/blog/wp-content/object-cache.php b/blog/wp-content/object-cache.php
index 2cf7e10..4f21322 100644
--- a/blog/wp-content/object-cache.php
+++ b/blog/wp-content/object-cache.php
@@ -236,14 +236,14 @@ class WP_Object_Cache {
 		return $return;
 	}
 
-	function key($key, $group) {	
+	function key($key, $group) {
 		global $blog_id;
 
 		if ( empty($group) )
 			$group = 'default';
 
 		if (false !== array_search($group, $this->global_groups))
-			$prefix = '';
+			$prefix = $blog_id;
 		else
 			$prefix = $blog_id . ':';