diff --git a/wp-admin/includes/class-wp-upgrader.php b/wp-admin/includes/class-wp-upgrader.php
index 0d2ece3833..d42172035f 100644
--- a/wp-admin/includes/class-wp-upgrader.php
+++ b/wp-admin/includes/class-wp-upgrader.php
@@ -360,7 +360,7 @@ class WP_Upgrader {
 class Plugin_Upgrader extends WP_Upgrader {
 
 	var $result;
-	var $bulk = true;
+	var $bulk = false;
 	var $show_before = '';
 
 	function upgrade_strings() {