diff --git src/wp-includes/ms-blogs.php src/wp-includes/ms-blogs.php
index 0468f12646..c10196b92b 100644
--- src/wp-includes/ms-blogs.php
+++ src/wp-includes/ms-blogs.php
@@ -293,14 +293,11 @@ function refresh_blog_details( $blog_id = 0 ) {
  *
  * @since MU (3.0.0)
  *
- * @global wpdb $wpdb WordPress database abstraction object.
- *
  * @param int   $blog_id Blog ID.
  * @param array $details Array of details keyed by blogs table field names.
  * @return bool True if update succeeds, false otherwise.
  */
 function update_blog_details( $blog_id, $details = array() ) {
-	global $wpdb;
 
 	if ( empty( $details ) ) {
 		return false;