diff --git a/src/wp-includes/capabilities.php b/src/wp-includes/capabilities.php
index 2279c16b62..e744175c9c 100644
--- a/src/wp-includes/capabilities.php
+++ b/src/wp-includes/capabilities.php
@@ -432,6 +432,10 @@ function map_meta_cap( $cap, $user_id ) {
 		break;
 	case 'install_languages':
 	case 'update_languages':
+		if ( ! function_exists( 'request_filesystem_credentials' ) ) {
+			require_once( ABSPATH . 'wp-admin/includes/file.php' );
+		}
+
 		if ( ! function_exists( 'wp_can_install_language_pack' ) ) {
 			require_once( ABSPATH . 'wp-admin/includes/translation-install.php' );
 		}