diff --git a/push-syndication.php b/push-syndication.php
index f709836d85d74975cf6cc5ae4f2cb3913dc5b0d5..5d73c0c39b94eb00a185c1e141e36b1f0db2dc24 100644
--- a/push-syndication.php
+++ b/push-syndication.php
@@ -12,6 +12,9 @@ License:      GPLv2 or later
 
 **************************************************************************/
 
+if ( ! defined( 'PUSH_SYNDICATE_KEY' ) )
+	define( 'PUSH_SYNDICATE_KEY', '' );
+
 require_once ( dirname( __FILE__ ) . '/includes/class-wp-push-syndication-server.php' );
 if( apply_filters( 'syn_use_async_jobs', false ) )
     require_once ( dirname( __FILE__ ) . '/includes/class-wpcom-push-syndication-server.php' );