diff --git a/lib/Doctrine/ORM/UnitOfWork.php b/lib/Doctrine/ORM/UnitOfWork.php
index 146789397..0e55cfa80 100644
--- a/lib/Doctrine/ORM/UnitOfWork.php
+++ b/lib/Doctrine/ORM/UnitOfWork.php
@@ -637,6 +637,15 @@ class UnitOfWork implements PropertyChangedListener
         foreach ($class->associationMappings as $field => $assoc) {
             if (($val = $class->reflFields[$field]->getValue($entity)) !== null) {
                 $this->computeAssociationChanges($assoc, $val);
+                if (!isset($this->entityChangeSets[$oid]) &&
+                    $assoc['isOwningSide'] &&
+                    $assoc['type'] == ClassMetadata::MANY_TO_MANY &&
+                    $val instanceof PersistentCollection &&
+                    $val->isDirty()) {
+                    $this->entityChangeSets[$oid]   = array();
+                    $this->originalEntityData[$oid] = $actualData;
+                    $this->entityUpdates[$oid]      = $entity;
+                }
             }
         }
     }
diff --git a/tests/Doctrine/Tests/ORM/Functional/ManyToManyEventTest.php b/tests/Doctrine/Tests/ORM/Functional/ManyToManyEventTest.php
new file mode 100644
index 000000000..47c96b1fe
--- /dev/null
+++ b/tests/Doctrine/Tests/ORM/Functional/ManyToManyEventTest.php
@@ -0,0 +1,76 @@
+<?php
+namespace Doctrine\Tests\ORM\Functional;
+use Doctrine\Tests\Models\CMS\CmsUser;
+use Doctrine\Tests\Models\CMS\CmsGroup;
+use Doctrine\ORM\Events;
+require_once __DIR__ . '/../../TestInit.php';
+
+/**
+ * ManyToManyEventTest
+ *
+ * @author Francisco Facioni <fran6co@gmail.com>
+ */
+class ManyToManyEventTest extends \Doctrine\Tests\OrmFunctionalTestCase
+{
+    /**
+     * @var PostUpdateListener
+     */
+    private $listener;
+
+    protected function setUp()
+    {
+        $this->useModelSet('cms');
+        parent::setUp();
+        $this->listener = new PostUpdateListener();
+        $evm = $this->_em->getEventManager();
+        $evm->addEventListener(Events::postUpdate, $this->listener);
+    }
+
+    public function testListenerShouldBeNotifiedOnlyWhenUpdating()
+    {
+        $user = $this->createNewValidUser();
+        $this->_em->persist($user);
+        $this->_em->flush();
+        $this->assertFalse($this->listener->wasNotified);
+
+        $group = new CmsGroup();
+        $group->name = "admins";
+        $user->addGroup($group);
+        $this->_em->persist($user);
+        $this->_em->flush();
+
+        $this->assertTrue($this->listener->wasNotified);
+    }
+
+    /**
+     * @return CmsUser
+     */
+    private function createNewValidUser()
+    {
+        $user = new CmsUser();
+        $user->username = 'fran6co';
+        $user->name = 'Francisco Facioni';
+        $group = new CmsGroup();
+        $group->name = "users";
+        $user->addGroup($group);
+        return $user;
+    }
+}
+
+class PostUpdateListener
+{
+    /**
+     * @var bool
+     */
+    public $wasNotified = false;
+
+    /**
+     * @param $args
+     */
+    public function postUpdate($args)
+    {
+        $this->wasNotified = true;
+    }
+}
+
+