diff --git a/mongodb/BSON/Document.php b/mongodb/BSON/Document.php
index 37b3fe610..13a3ae0da 100644
--- a/mongodb/BSON/Document.php
+++ b/mongodb/BSON/Document.php
@@ -6,7 +6,7 @@
  * @since 1.16.0
  * @link https://secure.php.net/manual/en/class.mongodb-bson-document.php
  */
-final class Document implements \IteratorAggregate, \Serializable
+final class Document implements \ArrayAccess, \IteratorAggregate, \Serializable
 {
     private function __construct() {}
 
diff --git a/mongodb/BSON/PackedArray.php b/mongodb/BSON/PackedArray.php
index 1cb83bfdb..fdafa883a 100644
--- a/mongodb/BSON/PackedArray.php
+++ b/mongodb/BSON/PackedArray.php
@@ -6,7 +6,7 @@
  * @since 1.16.0
  * @link https://secure.php.net/manual/en/class.mongodb-bson-packedarray.php
  */
-final class PackedArray implements \IteratorAggregate, \Serializable
+final class PackedArray implements \ArrayAccess, \IteratorAggregate, \Serializable
 {
     private function __construct() {}