diff --git a/src/Symfony/Component/PropertyInfo/Extractor/ReflectionExtractor.php b/src/Symfony/Component/PropertyInfo/Extractor/ReflectionExtractor.php
index 0e7bb091adc80..8ba5db00d352b 100644
--- a/src/Symfony/Component/PropertyInfo/Extractor/ReflectionExtractor.php
+++ b/src/Symfony/Component/PropertyInfo/Extractor/ReflectionExtractor.php
@@ -76,7 +76,7 @@ public function getProperties($class, array $context = array())
             if (!$propertyName || isset($properties[$propertyName])) {
                 continue;
             }
-            if (!preg_match('/^[A-Z]{2,}/', $propertyName)) {
+            if (!$reflectionClass->hasProperty($propertyName) && !preg_match('/^[A-Z]{2,}/', $propertyName)) {
                 $propertyName = lcfirst($propertyName);
             }
             $properties[$propertyName] = true;
diff --git a/src/Symfony/Component/PropertyInfo/Tests/Extractors/ReflectionExtractorTest.php b/src/Symfony/Component/PropertyInfo/Tests/Extractors/ReflectionExtractorTest.php
index 6af92affe03d5..55f75b901671f 100644
--- a/src/Symfony/Component/PropertyInfo/Tests/Extractors/ReflectionExtractorTest.php
+++ b/src/Symfony/Component/PropertyInfo/Tests/Extractors/ReflectionExtractorTest.php
@@ -38,6 +38,7 @@ public function testGetProperties()
                 'parent',
                 'collection',
                 'B',
+                'Guid',
                 'g',
                 'foo',
                 'foo2',
@@ -47,6 +48,7 @@ public function testGetProperties()
                 'files',
                 'a',
                 'DOB',
+                'Id',
                 'c',
                 'd',
                 'e',
@@ -129,6 +131,10 @@ public function testIsReadable()
         $this->assertTrue($this->extractor->isReadable('Symfony\Component\PropertyInfo\Tests\Fixtures\Dummy', 'd', array()));
         $this->assertFalse($this->extractor->isReadable('Symfony\Component\PropertyInfo\Tests\Fixtures\Dummy', 'e', array()));
         $this->assertFalse($this->extractor->isReadable('Symfony\Component\PropertyInfo\Tests\Fixtures\Dummy', 'f', array()));
+        $this->assertTrue($this->extractor->isReadable('Symfony\Component\PropertyInfo\Tests\Fixtures\Dummy', 'Id', array()));
+        $this->assertTrue($this->extractor->isReadable('Symfony\Component\PropertyInfo\Tests\Fixtures\Dummy', 'id', array()));
+        $this->assertTrue($this->extractor->isReadable('Symfony\Component\PropertyInfo\Tests\Fixtures\Dummy', 'Guid', array()));
+        $this->assertFalse($this->extractor->isReadable('Symfony\Component\PropertyInfo\Tests\Fixtures\Dummy', 'guid', array()));
     }
 
     public function testIsWritable()
@@ -142,5 +148,8 @@ public function testIsWritable()
         $this->assertFalse($this->extractor->isWritable('Symfony\Component\PropertyInfo\Tests\Fixtures\Dummy', 'd', array()));
         $this->assertTrue($this->extractor->isWritable('Symfony\Component\PropertyInfo\Tests\Fixtures\Dummy', 'e', array()));
         $this->assertTrue($this->extractor->isWritable('Symfony\Component\PropertyInfo\Tests\Fixtures\Dummy', 'f', array()));
+        $this->assertFalse($this->extractor->isWritable('Symfony\Component\PropertyInfo\Tests\Fixtures\Dummy', 'Id', array()));
+        $this->assertTrue($this->extractor->isWritable('Symfony\Component\PropertyInfo\Tests\Fixtures\Dummy', 'Guid', array()));
+        $this->assertFalse($this->extractor->isWritable('Symfony\Component\PropertyInfo\Tests\Fixtures\Dummy', 'guid', array()));
     }
 }
diff --git a/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Dummy.php b/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Dummy.php
index 12065b18b62a3..2f6fc11b0de5a 100644
--- a/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Dummy.php
+++ b/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Dummy.php
@@ -51,6 +51,16 @@ class Dummy extends ParentDummy
      */
     public $B;
 
+    /**
+     * @var int
+     */
+    protected $Id;
+
+    /**
+     * @var string
+     */
+    public $Guid;
+
     /**
      * Nullable array.
      *
@@ -99,4 +109,11 @@ public function setB(ParentDummy $parent = null)
     public function getDOB()
     {
     }
+
+    /**
+     * @return int
+     */
+    public function getId()
+    {
+    }
 }