diff --git a/src/WP_CLI/CommandWithUpgrade.php b/src/WP_CLI/CommandWithUpgrade.php
index e4d77e117..237fa5d3e 100755
--- a/src/WP_CLI/CommandWithUpgrade.php
+++ b/src/WP_CLI/CommandWithUpgrade.php
@@ -13,6 +13,7 @@
 
 abstract class CommandWithUpgrade extends \WP_CLI_Command {
 
+	protected $fetcher;
 	protected $item_type;
 	protected $obj_fields;