diff --git a/src/Symfony/Component/Form/CHANGELOG.md b/src/Symfony/Component/Form/CHANGELOG.md
index 636d84404a..e22e5826fb 100644
--- a/src/Symfony/Component/Form/CHANGELOG.md
+++ b/src/Symfony/Component/Form/CHANGELOG.md
@@ -4,6 +4,7 @@ CHANGELOG
 5.1.0
 -----
 
+ * Added `collection_entry` block prefix to `CollectionType` entries
  * Added a `choice_filter` option to `ChoiceType`
  * Added argument `callable|null $filter` to `ChoiceListFactoryInterface::createListFromChoices()` and `createListFromLoader()` - not defining them is deprecated.
  * Added a `ChoiceList` facade to leverage explicit choice list caching based on options
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/CollectionType.php b/src/Symfony/Component/Form/Extension/Core/Type/CollectionType.php
index b441f08ce6..d4023ecb5f 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/CollectionType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/CollectionType.php
@@ -72,8 +72,32 @@ class CollectionType extends AbstractType
      */
     public function finishView(FormView $view, FormInterface $form, array $options)
     {
-        if ($form->getConfig()->hasAttribute('prototype') && $view->vars['prototype']->vars['multipart']) {
-            $view->vars['multipart'] = true;
+        $prefixOffset = -1;
+        // check if the entry type also defines a block prefix
+        /** @var FormInterface $entry */
+        foreach ($form as $entry) {
+            if ($entry->getConfig()->getOption('block_prefix')) {
+                --$prefixOffset;
+            }
+
+            break;
+        }
+
+        foreach ($view as $entryView) {
+            array_splice($entryView->vars['block_prefixes'], $prefixOffset, 0, 'collection_entry');
+        }
+
+        /** @var FormInterface $prototype */
+        if ($prototype = $form->getConfig()->getAttribute('prototype')) {
+            if ($view->vars['prototype']->vars['multipart']) {
+                $view->vars['multipart'] = true;
+            }
+
+            if ($prefixOffset > -2 && $prototype->getConfig()->getOption('block_prefix')) {
+                --$prefixOffset;
+            }
+
+            array_splice($view->vars['prototype']->vars['block_prefixes'], $prefixOffset, 0, 'collection_entry');
         }
     }
 
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/CollectionTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/CollectionTypeTest.php
index 583a7c4f8b..a610c24a04 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/Type/CollectionTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/CollectionTypeTest.php
@@ -13,6 +13,7 @@ namespace Symfony\Component\Form\Tests\Extension\Core\Type;
 
 use Symfony\Component\Form\Tests\Fixtures\Author;
 use Symfony\Component\Form\Tests\Fixtures\AuthorType;
+use Symfony\Component\Form\Tests\Fixtures\BlockPrefixedFooTextType;
 
 class CollectionTypeTest extends BaseTypeTest
 {
@@ -404,6 +405,62 @@ class CollectionTypeTest extends BaseTypeTest
         $this->assertFalse($child->createView()->vars['prototype']->vars['required'], '"Prototype" should not be required');
     }
 
+    public function testEntriesBlockPrefixes()
+    {
+        $collectionView = $this->factory->createNamed('fields', static::TESTED_TYPE, [''], [
+            'allow_add' => true,
+        ])
+            ->createView()
+        ;
+
+        $expectedBlockPrefixes = [
+            'form',
+            'text',
+            'collection_entry',
+            '_fields_entry',
+        ];
+
+        $this->assertCount(1, $collectionView);
+        $this->assertSame($expectedBlockPrefixes, $collectionView[0]->vars['block_prefixes']);
+        $this->assertSame($expectedBlockPrefixes, $collectionView->vars['prototype']->vars['block_prefixes']);
+    }
+
+    public function testEntriesBlockPrefixesWithCustomBlockPrefix()
+    {
+        $collectionView = $this->factory->createNamed('fields', static::TESTED_TYPE, [''], [
+            'entry_options' => ['block_prefix' => 'field'],
+        ])
+            ->createView()
+        ;
+
+        $this->assertCount(1, $collectionView);
+        $this->assertSame([
+            'form',
+            'text',
+            'collection_entry',
+            'field',
+            '_fields_entry',
+        ], $collectionView[0]->vars['block_prefixes']);
+    }
+
+    public function testEntriesBlockPrefixesWithCustomBlockPrefixedType()
+    {
+        $collectionView = $this->factory->createNamed('fields', static::TESTED_TYPE, [''], [
+            'entry_type' => BlockPrefixedFooTextType::class,
+        ])
+            ->createView()
+        ;
+
+        $this->assertCount(1, $collectionView);
+        $this->assertSame([
+            'form',
+            'block_prefixed_foo_text',
+            'collection_entry',
+            'foo',
+            '_fields_entry',
+        ], $collectionView[0]->vars['block_prefixes']);
+    }
+
     public function testSubmitNull($expected = null, $norm = null, $view = null)
     {
         parent::testSubmitNull([], [], []);
diff --git a/src/Symfony/Component/Form/Tests/Fixtures/BlockPrefixedFooTextType.php b/src/Symfony/Component/Form/Tests/Fixtures/BlockPrefixedFooTextType.php
new file mode 100644
index 0000000000..3fda7a55dd
--- /dev/null
+++ b/src/Symfony/Component/Form/Tests/Fixtures/BlockPrefixedFooTextType.php
@@ -0,0 +1,23 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Form\Tests\Fixtures;
+
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+class BlockPrefixedFooTextType extends AbstractType
+{
+    public function configureOptions(OptionsResolver $resolver)
+    {
+        $resolver->setDefault('block_prefix', 'foo');
+    }
+}