diff --git a/plugins/woocommerce/changelog/pr-44896 b/plugins/woocommerce/changelog/pr-44896
new file mode 100644
index 00000000000..f5e0a00d32e
--- /dev/null
+++ b/plugins/woocommerce/changelog/pr-44896
@@ -0,0 +1,4 @@
+Significance: patch
+Type: tweak
+
+Make dynamic properties explicit in WC_Order_Item
\ No newline at end of file
diff --git a/plugins/woocommerce/includes/class-wc-order-item.php b/plugins/woocommerce/includes/class-wc-order-item.php
index 376104f0fd9..4c61d962868 100644
--- a/plugins/woocommerce/includes/class-wc-order-item.php
+++ b/plugins/woocommerce/includes/class-wc-order-item.php
@@ -16,6 +16,21 @@ defined( 'ABSPATH' ) || exit;
  * Order item class.
  */
 class WC_Order_Item extends WC_Data implements ArrayAccess {
+	/**
+	 * Legacy cart item values.
+	 *
+	 * @deprecated 4.4.0 For legacy actions.
+	 * @var array
+	 */
+	public $legacy_values;
+
+	/**
+	 * Legacy cart item keys.
+	 *
+	 * @deprecated 4.4.0 For legacy actions.
+	 * @var string
+	 */
+	public $legacy_cart_item_key;
 
 	/**
 	 * Order Data array. This is the core order data exposed in APIs since 3.0.0.