diff --git a/src/Composer/Util/Http/CurlDownloader.php b/src/Composer/Util/Http/CurlDownloader.php
index 96f0dfe8ecad..3cbdf4079dce 100644
--- a/src/Composer/Util/Http/CurlDownloader.php
+++ b/src/Composer/Util/Http/CurlDownloader.php
@@ -356,7 +356,7 @@ public function tick()
                     if (
                         (!isset($job['options']['http']['method']) || $job['options']['http']['method'] === 'GET')
                         && (
-                            in_array($errno, array(7 /* CURLE_COULDNT_CONNECT */, 16 /* CURLE_HTTP2 */, 92 /* CURLE_HTTP2_STREAM */), true)
+                            in_array($errno, array(7 /* CURLE_COULDNT_CONNECT */, 16 /* CURLE_HTTP2 */, 92 /* CURLE_HTTP2_STREAM */, 6 /* CURLE_COULDNT_RESOLVE_HOST */), true)
                             || ($errno === 35 /* CURLE_SSL_CONNECT_ERROR */ && false !== strpos($error, 'Connection reset by peer'))
                         ) && $job['attributes']['retries'] < $this->maxRetries
                     ) {