diff --git a/includes/class-wc-order-item.php b/includes/class-wc-order-item.php
index 3a39348a3d6..cc57147c6d4 100644
--- a/includes/class-wc-order-item.php
+++ b/includes/class-wc-order-item.php
@@ -294,7 +294,7 @@ class WC_Order_Item extends WC_Data implements ArrayAccess {
 			$return = array();
 
 			foreach ( $this->meta_data as $meta ) {
-				$return[ $meta->id ] = $meta;
+				$return[ $meta->key ] = $meta;
 			}
 
 			return $return;