diff --git a/includes/Classifai/Providers/Watson/NLU.php b/includes/Classifai/Providers/Watson/NLU.php
index 72f9ca0c3..0d30e9115 100644
--- a/includes/Classifai/Providers/Watson/NLU.php
+++ b/includes/Classifai/Providers/Watson/NLU.php
@@ -27,6 +27,11 @@ class NLU extends Provider {
 	 */
 	public $save_post_handler;
 
+	/**
+	 * @var $nlu_features array The list of NLU features
+	 */
+	protected $nlu_features = [];
+
 	/**
 	 * Watson NLU constructor.
 	 *