diff --git a/lib/Doctrine/ORM/EntityManager.php b/lib/Doctrine/ORM/EntityManager.php
index 0679ce85b..d8ef431ab 100644
--- a/lib/Doctrine/ORM/EntityManager.php
+++ b/lib/Doctrine/ORM/EntityManager.php
@@ -19,7 +19,7 @@
 
 namespace Doctrine\ORM;
 
-use Closure, Exception,
+use Exception,
     Doctrine\Common\EventManager,
     Doctrine\Common\Persistence\ObjectManager,
     Doctrine\DBAL\Connection,
@@ -210,15 +210,19 @@ class EntityManager implements ObjectManager
      * If an exception occurs during execution of the function or flushing or transaction commit,
      * the transaction is rolled back, the EntityManager closed and the exception re-thrown.
      *
-     * @param Closure $func The function to execute transactionally.
+     * @param callable $func The function to execute transactionally.
      * @return mixed Returns the non-empty value returned from the closure or true instead
      */
-    public function transactional(Closure $func)
+    public function transactional($func)
     {
+        if (!is_callable($func)) {
+            throw new \InvalidArgumentException('Expected argument of type "callable", got "' . gettype($func) . '"');
+        }
+
         $this->conn->beginTransaction();
 
         try {
-            $return = $func($this);
+            $return = call_user_func($func, $this);
 
             $this->flush();
             $this->conn->commit();
diff --git a/tests/Doctrine/Tests/ORM/EntityManagerTest.php b/tests/Doctrine/Tests/ORM/EntityManagerTest.php
index 4c4787763..7de921359 100644
--- a/tests/Doctrine/Tests/ORM/EntityManagerTest.php
+++ b/tests/Doctrine/Tests/ORM/EntityManagerTest.php
@@ -155,4 +155,21 @@ class EntityManagerTest extends \Doctrine\Tests\OrmTestCase
 
         $this->assertEquals('foo', $return);
     }
-}
\ No newline at end of file
+
+    public function testTransactionalAcceptsVariousCallables()
+    {
+        $this->assertSame('callback', $this->_em->transactional(array($this, 'transactionalCallback')));
+    }
+
+    public function testTransactionalThrowsInvalidArgumentExceptionIfNonCallablePassed()
+    {
+        $this->setExpectedException('InvalidArgumentException', 'Expected argument of type "callable", got "object"');
+        $this->_em->transactional($this);
+    }
+
+    public function transactionalCallback($em)
+    {
+        $this->assertSame($this->_em, $em);
+        return 'callback';
+    }
+}