diff --git a/repository/s3/lib.php b/repository/s3/lib.php
index ac69190230e..efb99094f96 100644
--- a/repository/s3/lib.php
+++ b/repository/s3/lib.php
@@ -43,6 +43,7 @@ class repository_s3 extends repository {
      * @param array $options
      */
     public function __construct($repositoryid, $context = SYSCONTEXTID, $options = array()) {
+        global $CFG;
         parent::__construct($repositoryid, $context, $options);
         $this->access_key = get_config('s3', 'access_key');
         $this->secret_key = get_config('s3', 'secret_key');
@@ -52,6 +53,26 @@ class repository_s3 extends repository {
         }
         $this->s = new S3($this->access_key, $this->secret_key, false, $this->endpoint);
         $this->s->setExceptions(true);
+
+        // Port of curl::__construct().
+        if (!empty($CFG->proxyhost)) {
+            if (empty($CFG->proxyport)) {
+                $proxyhost = $CFG->proxyhost;
+            } else {
+                $proxyhost = $CFG->proxyhost . ':' . $CFG->proxyport;
+            }
+            $proxytype = CURLPROXY_HTTP;
+            $proxyuser = null;
+            $proxypass = null;
+            if (!empty($CFG->proxyuser) and !empty($CFG->proxypassword)) {
+                $proxyuser = $CFG->proxyuser;
+                $proxypass = $CFG->proxypassword;
+            }
+            if (!empty($CFG->proxytype) && $CFG->proxytype == 'SOCKS5') {
+                $proxytype = CURLPROXY_SOCKS5;
+            }
+            $this->s->setProxy($proxyhost, $proxyuser, $proxypass, $proxytype);
+        }
     }
 
     /**