diff --git a/src/Symfony/Component/HttpFoundation/Request.php b/src/Symfony/Component/HttpFoundation/Request.php
index d28f9fc2101d..1e23db60b32d 100644
--- a/src/Symfony/Component/HttpFoundation/Request.php
+++ b/src/Symfony/Component/HttpFoundation/Request.php
@@ -1055,7 +1055,11 @@ public function getContentType()
      */
     public function setDefaultLocale($locale)
     {
-        $this->setPhpDefaultLocale($this->defaultLocale = $locale);
+        $this->defaultLocale = $locale;
+
+        if (null === $this->locale) {
+            $this->setPhpDefaultLocale($locale);
+        }
     }
 
     /**
diff --git a/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php b/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
index 0a03eeb6514c..c02b35a00ba9 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
@@ -900,6 +900,27 @@ public function testIsXmlHttpRequest()
         $this->assertFalse($request->isXmlHttpRequest());
     }
 
+    public function testIntlLocale()
+    {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('The intl extension is needed to run this test.');
+        }
+
+        $request = new Request();
+
+        $request->setDefaultLocale('fr');
+        $this->assertEquals('fr', $request->getLocale());
+        $this->assertEquals('fr', \Locale::getDefault());
+
+        $request->setLocale('en');
+        $this->assertEquals('en', $request->getLocale());
+        $this->assertEquals('en', \Locale::getDefault());
+
+        $request->setDefaultLocale('de');
+        $this->assertEquals('en', $request->getLocale());
+        $this->assertEquals('en', \Locale::getDefault());
+    }
+
     public function testGetCharsets()
     {
         $request = new Request();