diff --git a/sdk/aws-autoloader.php b/sdk/aws-autoloader.php
index 1003138a2..4c8cf78eb 100644
--- a/sdk/aws-autoloader.php
+++ b/sdk/aws-autoloader.php
@@ -2826,8 +2826,13 @@
     }
 }, true);
 
-require __DIR__ . '/Aws/functions.php';
-require __DIR__ . '/GuzzleHttp/functions_include.php';
+if ((!isset($CFG->libraries) && !file_exists($CFG->libraries . '/optional/aws/aws-sdk-php/src/functions.php'))
+    && !function_exists('Aws\constantly'))  {
+    require_once __DIR__ . '/Aws/functions.php';
+}
+if (!function_exists('GuzzleHttp\describe_type')) {
+    require_once __DIR__ . '/GuzzleHttp/functions_include.php';
+}
 require __DIR__ . '/GuzzleHttp/Psr7/functions_include.php';
 require __DIR__ . '/GuzzleHttp/Promise/functions_include.php';
 require __DIR__ . '/JmesPath/JmesPath.php';