diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
index 22e8fd65e8..a90308101a 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
@@ -173,6 +173,7 @@ class WP_REST_Attachments_Controller extends WP_REST_Posts_Controller {
 		do_action( 'rest_insert_attachment', $attachment, $request, true );
 
 		// Include admin function to get access to wp_generate_attachment_metadata().
+		require_once ABSPATH . 'wp-admin/includes/media.php';
 		require_once ABSPATH . 'wp-admin/includes/image.php';
 
 		wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $file ) );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 92c5ea4666..abadfff698 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-beta2-43849';
+$wp_version = '5.0-beta2-43850';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.