diff --git a/src/Symfony/Component/HttpClient/CurlHttpClient.php b/src/Symfony/Component/HttpClient/CurlHttpClient.php
index 766cf222c2b6f..42388a65e0c1d 100644
--- a/src/Symfony/Component/HttpClient/CurlHttpClient.php
+++ b/src/Symfony/Component/HttpClient/CurlHttpClient.php
@@ -170,7 +170,7 @@ public function request(string $method, string $url, array $options = []): Respo
             $curlopts[\CURLOPT_DNS_USE_GLOBAL_CACHE] = false;
         }
 
-        if (\defined('CURLOPT_HEADEROPT')) {
+        if (\defined('CURLOPT_HEADEROPT') && \defined('CURLHEADER_SEPARATE')) {
             $curlopts[\CURLOPT_HEADEROPT] = \CURLHEADER_SEPARATE;
         }