diff --git a/lib/Doctrine/ORM/Proxy/ProxyFactory.php b/lib/Doctrine/ORM/Proxy/ProxyFactory.php
index 61c697f62..21d033e7e 100644
--- a/lib/Doctrine/ORM/Proxy/ProxyFactory.php
+++ b/lib/Doctrine/ORM/Proxy/ProxyFactory.php
@@ -125,22 +125,27 @@ class ProxyFactory
      * @param string $toDir The target directory of the proxy classes. If not specified, the
      *                      directory configured on the Configuration of the EntityManager used
      *                      by this factory is used.
+     * @return int Number of generated proxies.
      */
     public function generateProxyClasses(array $classes, $toDir = null)
     {
         $proxyDir = $toDir ?: $this->_proxyDir;
         $proxyDir = rtrim($proxyDir, DIRECTORY_SEPARATOR);
+        $num = 0;
 
         foreach ($classes as $class) {
             /* @var $class ClassMetadata */
-            if ($class->isMappedSuperclass) {
+            if ($class->isMappedSuperclass || $class->reflClass->isAbstract()) {
                 continue;
             }
 
             $proxyFileName = $this->getProxyFileName($class->name, $proxyDir);
 
             $this->_generateProxyClass($class, $proxyFileName, self::$_proxyClassTemplate);
+            $num++;
         }
+
+        return $num;
     }
 
     /**
diff --git a/tests/Doctrine/Tests/ORM/Proxy/ProxyClassGeneratorTest.php b/tests/Doctrine/Tests/ORM/Proxy/ProxyClassGeneratorTest.php
index ace2bb57b..894d500fe 100644
--- a/tests/Doctrine/Tests/ORM/Proxy/ProxyClassGeneratorTest.php
+++ b/tests/Doctrine/Tests/ORM/Proxy/ProxyClassGeneratorTest.php
@@ -155,6 +155,20 @@ class ProxyClassGeneratorTest extends \Doctrine\Tests\OrmTestCase
         $this->assertEquals(1, substr_count($classCode, 'function __sleep'));
     }
 
+    /**
+     * @group DDC-1771
+     */
+    public function testSkipAbstractClassesOnGeneration()
+    {
+        $cm = new \Doctrine\ORM\Mapping\ClassMetadata(__NAMESPACE__ . '\\AbstractClass');
+        $cm->initializeReflection(new \Doctrine\Common\Persistence\Mapping\RuntimeReflectionService);
+        $this->assertNotNull($cm->reflClass);
+
+        $num = $this->_proxyFactory->generateProxyClasses(array($cm));
+
+        $this->assertEquals(0, $num, "No proxies generated.");
+    }
+
     public function testNoConfigDir_ThrowsException()
     {
         $this->setExpectedException('Doctrine\ORM\Proxy\ProxyException');
@@ -183,3 +197,8 @@ class SleepClass
         return array('id');
     }
 }
+
+abstract class AbstractClass
+{
+
+}