diff --git a/src/Symfony/Component/HttpClient/Tests/HttplugClientTest.php b/src/Symfony/Component/HttpClient/Tests/HttplugClientTest.php
index 0e62425b6b698..41ed55eda7822 100644
--- a/src/Symfony/Component/HttpClient/Tests/HttplugClientTest.php
+++ b/src/Symfony/Component/HttpClient/Tests/HttplugClientTest.php
@@ -37,6 +37,9 @@ public static function tearDownAfterClass(): void
         TestHttpServer::stop();
     }
 
+    /**
+     * @requires function ob_gzhandler
+     */
     public function testSendRequest()
     {
         $client = new HttplugClient(new NativeHttpClient());
@@ -51,6 +54,9 @@ public function testSendRequest()
         $this->assertSame('HTTP/1.1', $body['SERVER_PROTOCOL']);
     }
 
+    /**
+     * @requires function ob_gzhandler
+     */
     public function testSendAsyncRequest()
     {
         $client = new HttplugClient(new NativeHttpClient());
diff --git a/src/Symfony/Component/HttpClient/Tests/Psr18ClientTest.php b/src/Symfony/Component/HttpClient/Tests/Psr18ClientTest.php
index d1f4deb03a006..65b7f5b3f6794 100644
--- a/src/Symfony/Component/HttpClient/Tests/Psr18ClientTest.php
+++ b/src/Symfony/Component/HttpClient/Tests/Psr18ClientTest.php
@@ -33,6 +33,9 @@ public static function tearDownAfterClass(): void
         TestHttpServer::stop();
     }
 
+    /**
+     * @requires function ob_gzhandler
+     */
     public function testSendRequest()
     {
         $factory = new Psr17Factory();
diff --git a/src/Symfony/Contracts/HttpClient/Test/HttpClientTestCase.php b/src/Symfony/Contracts/HttpClient/Test/HttpClientTestCase.php
index 994e92621ff25..10c6395c6acf8 100644
--- a/src/Symfony/Contracts/HttpClient/Test/HttpClientTestCase.php
+++ b/src/Symfony/Contracts/HttpClient/Test/HttpClientTestCase.php
@@ -25,6 +25,10 @@ abstract class HttpClientTestCase extends TestCase
 {
     public static function setUpBeforeClass(): void
     {
+        if (!function_exists('ob_gzhandler')) {
+            static::markTestSkipped('The "ob_gzhandler" function is not available.');
+        }
+
         TestHttpServer::start();
     }