diff --git a/src/Symfony/Component/HttpFoundation/Request.php b/src/Symfony/Component/HttpFoundation/Request.php
index ca3f465003bf0..bc5dfa17c1ae1 100644
--- a/src/Symfony/Component/HttpFoundation/Request.php
+++ b/src/Symfony/Component/HttpFoundation/Request.php
@@ -1309,6 +1309,11 @@ public function getLanguages()
                     for ($i = 0, $max = count($codes); $i < $max; $i++) {
                         if ($i == 0) {
                             $lang = strtolower($codes[0]);
+                            // First segment of compound language codes
+                            // is added to supported languages list
+                            if (!in_array($lang, $this->languages)) {
+                                $this->languages[] = $lang;
+                            }
                         } else {
                             $lang .= '_'.strtoupper($codes[$i]);
                         }
@@ -1316,7 +1321,9 @@ public function getLanguages()
                 }
             }
 
-            $this->languages[] = $lang;
+            if (!in_array($lang, $this->languages)) {
+                $this->languages[] = $lang;
+            }
         }
 
         return $this->languages;
diff --git a/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php b/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
index 535ebfc9a3cf6..b4a43fc1f2e25 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
@@ -951,8 +951,8 @@ public function testGetLanguages()
 
         $request = new Request();
         $request->headers->set('Accept-language', 'zh, en-us; q=0.8, en; q=0.6');
-        $this->assertEquals(array('zh', 'en_US', 'en'), $request->getLanguages());
-        $this->assertEquals(array('zh', 'en_US', 'en'), $request->getLanguages());
+        $this->assertEquals(array('zh', 'en', 'en_US'), $request->getLanguages());
+        $this->assertEquals(array('zh', 'en', 'en_US'), $request->getLanguages());
 
         $request = new Request();
         $request->headers->set('Accept-language', 'zh, en-us; q=0.6, en; q=0.8');
@@ -969,6 +969,10 @@ public function testGetLanguages()
         $request = new Request();
         $request->headers->set('Accept-language', 'zh, i-cherokee; q=0.6');
         $this->assertEquals(array('zh', 'cherokee'), $request->getLanguages());
+
+        $request = new Request();
+        $request->headers->set('Accept-language', 'en-us');
+        $this->assertEquals(array('en', 'en_US'), $request->getLanguages());
     }
 
     public function testGetRequestFormat()