diff --git a/src/Symfony/Component/HttpClient/Response/ResponseTrait.php b/src/Symfony/Component/HttpClient/Response/ResponseTrait.php
index c747f373a03a5..0452e9e7917eb 100644
--- a/src/Symfony/Component/HttpClient/Response/ResponseTrait.php
+++ b/src/Symfony/Component/HttpClient/Response/ResponseTrait.php
@@ -223,7 +223,7 @@ private static function initialize(self $response): void
     private static function addResponseHeaders(array $responseHeaders, array &$info, array &$headers, string &$debug = ''): void
     {
         foreach ($responseHeaders as $h) {
-            if (11 <= \strlen($h) && '/' === $h[4] && preg_match('#^HTTP/\d+(?:\.\d+)? ([12345]\d\d) .*#', $h, $m)) {
+            if (11 <= \strlen($h) && '/' === $h[4] && preg_match('#^HTTP/\d+(?:\.\d+)? ([12345]\d\d)(?: |$)#', $h, $m)) {
                 if ($headers) {
                     $debug .= "< \r\n";
                     $headers = [];