diff --git a/src/Bridge/Doctrine/Orm/Extension/EagerLoadingExtension.php b/src/Bridge/Doctrine/Orm/Extension/EagerLoadingExtension.php
index 75dfc4a8b57..5fa67f73d0b 100644
--- a/src/Bridge/Doctrine/Orm/Extension/EagerLoadingExtension.php
+++ b/src/Bridge/Doctrine/Orm/Extension/EagerLoadingExtension.php
@@ -74,9 +74,9 @@ private function joinRelations(QueryBuilder $queryBuilder, string $resourceClass
         $entityManager = $queryBuilder->getEntityManager();
         $classMetadata = $entityManager->getClassMetadata($resourceClass);
         $j = 0;
+        $i = 0;
 
-        foreach ($classMetadata->getAssociationNames() as $i => $association) {
-            $mapping = $classMetadata->associationMappings[$association];
+        foreach ($classMetadata->associationMappings as $association => $mapping) {
             $propertyMetadata = $this->propertyMetadataFactory->create($resourceClass, $association, $propertyMetadataOptions);
 
             if (ClassMetadataInfo::FETCH_EAGER !== $mapping['fetch'] || false === $propertyMetadata->isReadableLink()) {
@@ -95,7 +95,7 @@ private function joinRelations(QueryBuilder $queryBuilder, string $resourceClass
                 $method = 'leftJoin';
             }
 
-            $associationAlias = $relationAlias.$i;
+            $associationAlias = $relationAlias.$i++;
             $queryBuilder->{$method}($originAlias.'.'.$association, $associationAlias);
             $select = [];
             $targetClassMetadata = $entityManager->getClassMetadata($mapping['targetEntity']);
diff --git a/tests/Bridge/Doctrine/Orm/Extension/EagerLoadingExtensionTest.php b/tests/Bridge/Doctrine/Orm/Extension/EagerLoadingExtensionTest.php
index e3cdaf2c83d..4db34e85954 100644
--- a/tests/Bridge/Doctrine/Orm/Extension/EagerLoadingExtensionTest.php
+++ b/tests/Bridge/Doctrine/Orm/Extension/EagerLoadingExtensionTest.php
@@ -61,7 +61,6 @@ public function testApplyToCollection()
         $queryBuilderProphecy = $this->prophesize(QueryBuilder::class);
 
         $classMetadataProphecy = $this->prophesize(ClassMetadata::class);
-        $classMetadataProphecy->getAssociationNames()->shouldBeCalled()->willReturn([0 => 'relatedDummy', 'relatedDummy2']);
         $classMetadataProphecy->associationMappings = [
             'relatedDummy' => ['fetch' => 3, 'joinColumns' => [['nullable' => true]], 'targetEntity' => RelatedDummy::class],
             'relatedDummy2' => ['fetch' => 3, 'joinColumns' => [['nullable' => false]], 'targetEntity' => RelatedDummy::class],
@@ -75,7 +74,7 @@ public function testApplyToCollection()
             }
         }
 
-        $relatedClassMetadataProphecy->getAssociationNames()->shouldBeCalled()->willReturn([]);
+        $relatedClassMetadataProphecy->associationMappings = [];
 
         $emProphecy = $this->prophesize(EntityManager::class);
         $emProphecy->getClassMetadata(Dummy::class)->shouldBeCalled()->willReturn($classMetadataProphecy->reveal());
@@ -110,6 +109,7 @@ public function testApplyToItem()
         $propertyMetadataFactoryProphecy->create(Dummy::class, 'relatedDummy2', [])->willReturn($relationPropertyMetadata)->shouldBeCalled();
         $propertyMetadataFactoryProphecy->create(Dummy::class, 'relatedDummy3', [])->willReturn($relationPropertyMetadata)->shouldBeCalled();
         $propertyMetadataFactoryProphecy->create(Dummy::class, 'relatedDummy4', [])->willReturn($relationPropertyMetadata)->shouldBeCalled();
+        $propertyMetadataFactoryProphecy->create(Dummy::class, 'relatedDummy5', [])->willReturn($relationPropertyMetadata)->shouldBeCalled();
 
         $idPropertyMetadata = new PropertyMetadata();
         $idPropertyMetadata = $idPropertyMetadata->withIdentifier(true);
@@ -130,7 +130,6 @@ public function testApplyToItem()
         $queryBuilderProphecy = $this->prophesize(QueryBuilder::class);
 
         $classMetadataProphecy = $this->prophesize(ClassMetadata::class);
-        $classMetadataProphecy->getAssociationNames()->shouldBeCalled()->willReturn(['relatedDummy', 'relatedDummy2', 'relatedDummy3', 'relatedDummy4']);
         $classMetadataProphecy->associationMappings = [
             'relatedDummy' => ['fetch' => 3, 'joinColumns' => [['nullable' => true]], 'targetEntity' => RelatedDummy::class],
             'relatedDummy2' => ['fetch' => 3, 'joinColumns' => [['nullable' => false]], 'targetEntity' => UnknownDummy::class],
@@ -147,14 +146,12 @@ public function testApplyToItem()
             }
         }
 
-        $relatedClassMetadataProphecy->getAssociationNames()->shouldBeCalled()->willReturn(['relation']);
-
         $relatedClassMetadataProphecy->associationMappings = [
             'relation' => ['fetch' => 3, 'joinColumns' => [['nullable' => false]], 'targetEntity' => UnknownDummy::class],
         ];
 
         $unknownClassMetadataProphecy = $this->prophesize(ClassMetadata::class);
-        $unknownClassMetadataProphecy->getAssociationNames()->shouldBeCalled()->willReturn([]);
+        $unknownClassMetadataProphecy->associationMappings = [];
 
         $emProphecy = $this->prophesize(EntityManager::class);
         $emProphecy->getClassMetadata(Dummy::class)->shouldBeCalled()->willReturn($classMetadataProphecy->reveal());
@@ -188,7 +185,6 @@ public function testCreateItemWithOperationName()
         $propertyMetadataFactoryProphecy->create(Dummy::class, 'foo', ['item_operation_name' => 'item_operation'])->shouldBeCalled()->willReturn(new PropertyMetadata());
 
         $classMetadataProphecy = $this->prophesize(ClassMetadata::class);
-        $classMetadataProphecy->getAssociationNames()->shouldBeCalled()->willReturn(['foo']);
         $classMetadataProphecy->associationMappings = [
             'foo' => ['fetch' => 1],
         ];
@@ -209,7 +205,6 @@ public function testCreateCollectionWithOperationName()
         $propertyMetadataFactoryProphecy->create(Dummy::class, 'foo', ['collection_operation_name' => 'collection_operation'])->shouldBeCalled()->willReturn(new PropertyMetadata());
 
         $classMetadataProphecy = $this->prophesize(ClassMetadata::class);
-        $classMetadataProphecy->getAssociationNames()->shouldBeCalled()->willReturn(['foo']);
         $classMetadataProphecy->associationMappings = [
             'foo' => ['fetch' => 1],
         ];