diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6c42e79..a8be658 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+6.4
+---
+
+ * Allow setting the locale using `SYMFONY_PHPUNIT_LOCALE` env var
+
 6.3
 ---
 
diff --git a/Legacy/SymfonyTestsListenerTrait.php b/Legacy/SymfonyTestsListenerTrait.php
index 62e57b8..aa33500 100644
--- a/Legacy/SymfonyTestsListenerTrait.php
+++ b/Legacy/SymfonyTestsListenerTrait.php
@@ -50,6 +50,8 @@ class SymfonyTestsListenerTrait
      */
     public function __construct(array $mockedNamespaces = [])
     {
+        setlocale(\LC_ALL, $_ENV['SYMFONY_PHPUNIT_LOCALE'] ?? 'C');
+
         if (class_exists(ExcludeList::class)) {
             (new ExcludeList())->getExcludedDirectories();
             ExcludeList::addDirectory(\dirname((new \ReflectionClass(__CLASS__))->getFileName(), 2));
diff --git a/bootstrap.php b/bootstrap.php
index 2541cdd..f11b7ab 100644
--- a/bootstrap.php
+++ b/bootstrap.php
@@ -29,9 +29,6 @@
     unset($GLOBALS['__composer_autoload_files'][$fileIdentifier]);
 }
 
-// Enforce a consistent locale
-setlocale(\LC_ALL, 'C');
-
 if (class_exists(Deprecation::class)) {
     Deprecation::withoutDeduplication();