diff --git a/src/Environment.php b/src/Environment.php
index ead76e370..9efe23d21 100644
--- a/src/Environment.php
+++ b/src/Environment.php
@@ -63,7 +63,6 @@ class Environment
     private $resolvedGlobals;
     private $loadedTemplates;
     private $strictVariables;
-    private $templateClassPrefix = '__TwigTemplate_';
     private $originalCache;
     private $extensionSet;
     private $runtimeLoaders = [];
@@ -290,7 +289,7 @@ class Environment
     {
         $key = $this->getLoader()->getCacheKey($name).$this->optionsHash;
 
-        return $this->templateClassPrefix.hash(\PHP_VERSION_ID < 80100 ? 'sha256' : 'xxh128', $key).(null === $index ? '' : '___'.$index);
+        return '__TwigTemplate_'.hash(\PHP_VERSION_ID < 80100 ? 'sha256' : 'xxh128', $key).(null === $index ? '' : '___'.$index);
     }
 
     /**
diff --git a/src/Test/IntegrationTestCase.php b/src/Test/IntegrationTestCase.php
index 6462e413d..5519dd0a9 100644
--- a/src/Test/IntegrationTestCase.php
+++ b/src/Test/IntegrationTestCase.php
@@ -185,11 +185,6 @@ abstract class IntegrationTestCase extends TestCase
                 $twig->addFunction($function);
             }
 
-            // avoid using the same PHP class name for different cases
-            $p = new \ReflectionProperty($twig, 'templateClassPrefix');
-            $p->setAccessible(true);
-            $p->setValue($twig, '__TwigTemplate_'.hash(\PHP_VERSION_ID < 80100 ? 'sha256' : 'xxh128', random_bytes(32), false).'_');
-
             $deprecations = [];
             try {
                 $prevHandler = set_error_handler(function ($type, $msg, $file, $line, $context = []) use (&$deprecations, &$prevHandler) {