diff --git a/core/modules/serialization/tests/src/Unit/Normalizer/EntityNormalizerTest.php b/core/modules/serialization/tests/src/Unit/Normalizer/EntityNormalizerTest.php
index 06d280a9bd..3a4e32a9f9 100644
--- a/core/modules/serialization/tests/src/Unit/Normalizer/EntityNormalizerTest.php
+++ b/core/modules/serialization/tests/src/Unit/Normalizer/EntityNormalizerTest.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\Tests\serialization\Unit\Normalizer;
 
+use Drupal\Core\Entity\ContentEntityBase;
 use Drupal\Core\Entity\EntityFieldManagerInterface;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Entity\EntityTypeRepositoryInterface;
@@ -187,7 +188,7 @@ public function testDenormalizeWithValidBundle() {
     $key_1 = $this->createMock(FieldItemListInterface::class);
     $key_2 = $this->createMock(FieldItemListInterface::class);
 
-    $entity = $this->createMock(FieldableEntityInterface::class);
+    $entity = $this->createMock(ContentEntityBase::class);
     $entity->expects($this->exactly(2))
       ->method('get')
       ->willReturnMap([
@@ -340,7 +341,7 @@ public function testDenormalizeWithNoBundle() {
     $key_1 = $this->createMock(FieldItemListInterface::class);
     $key_2 = $this->createMock(FieldItemListInterface::class);
 
-    $entity = $this->createMock(FieldableEntityInterface::class);
+    $entity = $this->createMock(ContentEntityBase::class);
     $entity->expects($this->exactly(2))
       ->method('get')
       ->willReturnMap([
@@ -409,7 +410,7 @@ public function testDenormalizeWithNoFieldableEntityType() {
     $storage->expects($this->once())
       ->method('create')
       ->with($test_data)
-      ->will($this->returnValue($this->createMock('Drupal\Core\Entity\EntityInterface')));
+      ->will($this->returnValue($this->createMock(ContentEntityBase::class)));
 
     $this->entityTypeManager->expects($this->once())
       ->method('getStorage')