diff --git a/lib/filelib.php b/lib/filelib.php
index 2fda3478737..5569c5ea45c 100644
--- a/lib/filelib.php
+++ b/lib/filelib.php
@@ -3215,7 +3215,14 @@ class curl {
                     $this->proxy_type = CURLPROXY_SOCKS5;
                 } else {
                     $this->proxy_type = CURLPROXY_HTTP;
-                    $this->setopt(array('httpproxytunnel'=>false));
+                    $this->setopt([
+                        'httpproxytunnel' => false,
+                    ]);
+                    if (defined('CURLOPT_SUPPRESS_CONNECT_HEADERS')) {
+                        $this->setopt([
+                            'suppress_connect_headers' => true,
+                        ]);
+                    }
                 }
                 $this->setopt(array('proxytype'=>$this->proxy_type));
             }