diff --git a/lib/private/Files/ObjectStore/S3ConnectionTrait.php b/lib/private/Files/ObjectStore/S3ConnectionTrait.php
index d88ef0ac8e..9e0b12ec17 100644
--- a/lib/private/Files/ObjectStore/S3ConnectionTrait.php
+++ b/lib/private/Files/ObjectStore/S3ConnectionTrait.php
@@ -121,6 +121,7 @@ trait S3ConnectionTrait {
 			'use_path_style_endpoint' => isset($this->params['use_path_style']) ? $this->params['use_path_style'] : false,
 			'signature_provider' => \Aws\or_chain([self::class, 'legacySignatureProvider'], ClientResolver::_default_signature_provider()),
 			'csm' => false,
+			'use_arn_region' => false,
 		];
 		if (isset($this->params['proxy'])) {
 			$options['request.options'] = ['proxy' => $this->params['proxy']];