diff --git a/src/Symfony/Component/VarDumper/Tests/Caster/RdKafkaCasterTest.php b/src/Symfony/Component/VarDumper/Tests/Caster/RdKafkaCasterTest.php
index 24b8f4288e..f68d2bb713 100644
--- a/src/Symfony/Component/VarDumper/Tests/Caster/RdKafkaCasterTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/Caster/RdKafkaCasterTest.php
@@ -114,7 +114,7 @@ EODUMP;
 
         $expectedDump = <<<EODUMP
 RdKafka\TopicConf {
-  request.required.acks: "1"
+  request.required.acks: "%d"
   request.timeout.ms: "5000"
   message.timeout.ms: "300000"
 %A