Index: src/wp-admin/includes/ms.php
===================================================================
--- src/wp-admin/includes/ms.php	(revision 36504)
+++ src/wp-admin/includes/ms.php	(working copy)
@@ -749,16 +749,24 @@
  * @since 3.0.0
  *
  * @global int $wp_db_version The version number of the database.
+ * @global string $pagenow
  *
  * @return false False if the current user is not a super admin.
  */
 function site_admin_notice() {
-	global $wp_db_version;
-	if ( !is_super_admin() )
+	global $wp_db_version, $pagenow;
+	if ( ! is_super_admin() ) {
 		return false;
-	if ( get_site_option( 'wpmu_upgrade_site' ) != $wp_db_version )
+	}
+
+	if ( 'upgrade.php' == $pagenow ) {
+		return;
+	}
+
+	if ( get_site_option( 'wpmu_upgrade_site' ) != $wp_db_version ) {
 		echo "<div class='update-nag'>" . sprintf( __( 'Thank you for Updating! Please visit the <a href="%s">Upgrade Network</a> page to update all your sites.' ), esc_url( network_admin_url( 'upgrade.php' ) ) ) . "</div>";
 }
+}
 
 /**
  * Avoids a collision between a site slug and a permalink slug.