diff --git a/src/Symfony/Contracts/HttpClient/Test/Fixtures/web/index.php b/src/Symfony/Contracts/HttpClient/Test/Fixtures/web/index.php
index ec15196c65..ff68ab6878 100644
--- a/src/Symfony/Contracts/HttpClient/Test/Fixtures/web/index.php
+++ b/src/Symfony/Contracts/HttpClient/Test/Fixtures/web/index.php
@@ -86,7 +86,7 @@ switch ($vars['REQUEST_URI']) {
 
     case '/timeout-body':
         echo '<1>';
-        ob_flush();
+        @ob_flush();
         flush();
         usleep(500000);
         echo '<2>';
@@ -97,7 +97,7 @@ switch ($vars['REQUEST_URI']) {
         sleep(1);
         while (true) {
             echo '<1>';
-            ob_flush();
+            @ob_flush();
             flush();
             usleep(500);
         }