diff --git a/lib/private/Files/ObjectStore/S3ConnectionTrait.php b/lib/private/Files/ObjectStore/S3ConnectionTrait.php
index 9e0b12ec17..6e903829ef 100644
--- a/lib/private/Files/ObjectStore/S3ConnectionTrait.php
+++ b/lib/private/Files/ObjectStore/S3ConnectionTrait.php
@@ -57,6 +57,9 @@ trait S3ConnectionTrait {
 	/** @var int */
 	protected $timeout;
 
+	/** @var string */
+	protected $proxy;
+
 	/** @var int */
 	protected $uploadPartSize;
 
@@ -71,6 +74,7 @@ trait S3ConnectionTrait {
 
 		$this->test = isset($params['test']);
 		$this->bucket = $params['bucket'];
+		$this->proxy = isset($params['proxy']) ? $params['proxy'] : false;
 		$this->timeout = !isset($params['timeout']) ? 15 : $params['timeout'];
 		$this->uploadPartSize = !isset($params['uploadPartSize']) ? 524288000 : $params['uploadPartSize'];
 		$params['region'] = empty($params['region']) ? 'eu-west-1' : $params['region'];
@@ -86,6 +90,10 @@ trait S3ConnectionTrait {
 		return $this->bucket;
 	}
 
+	public function getProxy() {
+		return $this->proxy;
+	}
+
 	/**
 	 * Returns the connection
 	 *
@@ -124,7 +132,7 @@ trait S3ConnectionTrait {
 			'use_arn_region' => false,
 		];
 		if (isset($this->params['proxy'])) {
-			$options['request.options'] = ['proxy' => $this->params['proxy']];
+			$options['http'] = [ 'proxy' => $this->params['proxy'] ];
 		}
 		if (isset($this->params['legacy_auth']) && $this->params['legacy_auth']) {
 			$options['signature_version'] = 'v2';
diff --git a/lib/private/Files/ObjectStore/S3ObjectTrait.php b/lib/private/Files/ObjectStore/S3ObjectTrait.php
index 250f8fd1ed..697b705f80 100644
--- a/lib/private/Files/ObjectStore/S3ObjectTrait.php
+++ b/lib/private/Files/ObjectStore/S3ObjectTrait.php
@@ -70,6 +70,11 @@ trait S3ObjectTrait {
 				],
 			];
 
+			if ($this->getProxy()) {
+				$opts['http']['proxy'] = $this->getProxy();
+				$opts['http']['request_fulluri'] = true;
+			}
+
 			$context = stream_context_create($opts);
 			return fopen($request->getUri(), 'r', false, $context);
 		});