diff --git a/classes/external.php b/classes/external.php
index 3e18af60..718a5604 100644
--- a/classes/external.php
+++ b/classes/external.php
@@ -32,11 +32,11 @@
 require_once("$CFG->libdir/externallib.php");
 
 use context_module;
-use external_api;
-use external_function_parameters;
-use external_single_structure;
-use external_value;
-use external_warnings;
+use core_external\external_api;
+use core_external\external_function_parameters;
+use core_external\external_single_structure;
+use core_external\external_value;
+use core_external\external_warnings;
 use invalid_response_exception;
 
 /**