diff --git a/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php b/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
index fee254da65..4bf684bf3a 100644
--- a/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
+++ b/src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
@@ -95,9 +95,19 @@ class DoctrineExtractor implements PropertyListExtractorInterface, PropertyTypeE
 
                 if (isset($associationMapping['indexBy'])) {
                     $indexProperty = $associationMapping['indexBy'];
+                    /** @var ClassMetadataInfo $subMetadata */
                     $subMetadata = $this->classMetadataFactory->getMetadataFor($associationMapping['targetEntity']);
                     $typeOfField = $subMetadata->getTypeOfField($indexProperty);
 
+                    if (null === $typeOfField) {
+                        $associationMapping = $subMetadata->getAssociationMapping($indexProperty);
+
+                        /** @var ClassMetadataInfo $subMetadata */
+                        $indexProperty = $subMetadata->getSingleAssociationReferencedJoinColumnName($indexProperty);
+                        $subMetadata = $this->classMetadataFactory->getMetadataFor($associationMapping['targetEntity']);
+                        $typeOfField = $subMetadata->getTypeOfField($indexProperty);
+                    }
+
                     $collectionKeyType = $this->getPhpType($typeOfField);
                 }
             }
diff --git a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php
index 139601710e..8bc25718ec 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php
@@ -59,6 +59,7 @@ class DoctrineExtractorTest extends TestCase
                 'foo',
                 'bar',
                 'indexedBar',
+                'indexedFoo',
             ),
             $this->extractor->getProperties('Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures\DoctrineDummy')
         );
@@ -136,6 +137,14 @@ class DoctrineExtractorTest extends TestCase
                 new Type(Type::BUILTIN_TYPE_STRING),
                 new Type(Type::BUILTIN_TYPE_OBJECT, false, 'Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures\DoctrineRelation')
             ))),
+            array('indexedFoo', array(new Type(
+                Type::BUILTIN_TYPE_OBJECT,
+                false,
+                'Doctrine\Common\Collections\Collection',
+                true,
+                new Type(Type::BUILTIN_TYPE_STRING),
+                new Type(Type::BUILTIN_TYPE_OBJECT, false, 'Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures\DoctrineRelation')
+            ))),
             array('simpleArray', array(new Type(Type::BUILTIN_TYPE_ARRAY, false, null, true, new Type(Type::BUILTIN_TYPE_INT), new Type(Type::BUILTIN_TYPE_STRING)))),
             array('customFoo', null),
             array('notMapped', null),
diff --git a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineDummy.php b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineDummy.php
index 580e75803d..60fce8954c 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineDummy.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineDummy.php
@@ -14,6 +14,7 @@ namespace Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
 use Doctrine\ORM\Mapping\Id;
+use Doctrine\ORM\Mapping\OneToMany;
 use Doctrine\ORM\Mapping\ManyToMany;
 use Doctrine\ORM\Mapping\ManyToOne;
 
@@ -45,6 +46,11 @@ class DoctrineDummy
      */
     protected $indexedBar;
 
+    /**
+     * @OneToMany(targetEntity="DoctrineRelation", mappedBy="foo", indexBy="foo")
+     */
+    protected $indexedFoo;
+
     /**
      * @Column(type="guid")
      */
diff --git a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineRelation.php b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineRelation.php
index 6e94e028fa..85660d3d6b 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineRelation.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineRelation.php
@@ -14,6 +14,7 @@ namespace Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
 use Doctrine\ORM\Mapping\Id;
+use Doctrine\ORM\Mapping\ManyToOne;
 
 /**
  * @Entity
@@ -32,4 +33,10 @@ class DoctrineRelation
      * @Column(type="guid")
      */
     protected $rguid;
+
+    /**
+     * @Column(type="guid")
+     * @ManyToOne(targetEntity="DoctrineDummy", inversedBy="indexedFoo")
+     */
+    protected $foo;
 }