diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformerTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformerTest.php
index 8cdbb1959a..f918434715 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformerTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformerTest.php
@@ -17,13 +17,19 @@ use Symfony\Component\Intl\Util\IntlTestHelper;
 
 class IntegerToLocalizedStringTransformerTest extends TestCase
 {
+    private $defaultLocale;
+
     protected function setUp()
     {
-        parent::setUp();
-
+        $this->defaultLocale = \Locale::getDefault();
         \Locale::setDefault('en');
     }
 
+    protected function tearDown()
+    {
+        \Locale::setDefault($this->defaultLocale);
+    }
+
     public function transformWithRoundingProvider()
     {
         return [
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/NumberToLocalizedStringTransformerTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/NumberToLocalizedStringTransformerTest.php
index 1f05af6128..9baad43549 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/NumberToLocalizedStringTransformerTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/NumberToLocalizedStringTransformerTest.php
@@ -17,13 +17,19 @@ use Symfony\Component\Intl\Util\IntlTestHelper;
 
 class NumberToLocalizedStringTransformerTest extends TestCase
 {
+    private $defaultLocale;
+
     protected function setUp()
     {
-        parent::setUp();
-
+        $this->defaultLocale = \Locale::getDefault();
         \Locale::setDefault('en');
     }
 
+    protected function tearDown()
+    {
+        \Locale::setDefault($this->defaultLocale);
+    }
+
     public function provideTransformations()
     {
         return [
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/PercentToLocalizedStringTransformerTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/PercentToLocalizedStringTransformerTest.php
index c6007a398b..f726edcda4 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/PercentToLocalizedStringTransformerTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/PercentToLocalizedStringTransformerTest.php
@@ -17,13 +17,19 @@ use Symfony\Component\Intl\Util\IntlTestHelper;
 
 class PercentToLocalizedStringTransformerTest extends TestCase
 {
+    private $defaultLocale;
+
     protected function setUp()
     {
-        parent::setUp();
-
+        $this->defaultLocale = \Locale::getDefault();
         \Locale::setDefault('en');
     }
 
+    protected function tearDown()
+    {
+        \Locale::setDefault($this->defaultLocale);
+    }
+
     public function testTransform()
     {
         $transformer = new PercentToLocalizedStringTransformer();
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/DateTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/DateTypeTest.php
index 247a5d4b37..31dfc65af0 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/Type/DateTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/DateTypeTest.php
@@ -20,17 +20,19 @@ class DateTypeTest extends BaseTypeTest
     const TESTED_TYPE = 'Symfony\Component\Form\Extension\Core\Type\DateType';
 
     private $defaultTimezone;
+    private $defaultLocale;
 
     protected function setUp()
     {
         parent::setUp();
         $this->defaultTimezone = date_default_timezone_get();
+        $this->defaultLocale = \Locale::getDefault();
     }
 
     protected function tearDown()
     {
         date_default_timezone_set($this->defaultTimezone);
-        \Locale::setDefault('en');
+        \Locale::setDefault($this->defaultLocale);
     }
 
     /**
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/MoneyTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/MoneyTypeTest.php
index f75ea90249..34576ec630 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/Type/MoneyTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/MoneyTypeTest.php
@@ -17,6 +17,8 @@ class MoneyTypeTest extends BaseTypeTest
 {
     const TESTED_TYPE = 'Symfony\Component\Form\Extension\Core\Type\MoneyType';
 
+    private $defaultLocale;
+
     protected function setUp()
     {
         // we test against different locales, so we need the full
@@ -24,6 +26,15 @@ class MoneyTypeTest extends BaseTypeTest
         IntlTestHelper::requireFullIntl($this, false);
 
         parent::setUp();
+
+        $this->defaultLocale = \Locale::getDefault();
+    }
+
+    protected function tearDown()
+    {
+        parent::tearDown();
+
+        \Locale::setDefault($this->defaultLocale);
     }
 
     public function testPassMoneyPatternToView()
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/NumberTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/NumberTypeTest.php
index c19c82b117..9cc2893c66 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/Type/NumberTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/NumberTypeTest.php
@@ -17,6 +17,8 @@ class NumberTypeTest extends BaseTypeTest
 {
     const TESTED_TYPE = 'Symfony\Component\Form\Extension\Core\Type\NumberType';
 
+    private $defaultLocale;
+
     protected function setUp()
     {
         parent::setUp();
@@ -24,9 +26,17 @@ class NumberTypeTest extends BaseTypeTest
         // we test against "de_DE", so we need the full implementation
         IntlTestHelper::requireFullIntl($this, false);
 
+        $this->defaultLocale = \Locale::getDefault();
         \Locale::setDefault('de_DE');
     }
 
+    protected function tearDown()
+    {
+        parent::tearDown();
+
+        \Locale::setDefault($this->defaultLocale);
+    }
+
     public function testDefaultFormatting()
     {
         $form = $this->factory->create(static::TESTED_TYPE);