diff --git a/.github/workflows/test-application.yaml b/.github/workflows/test-application.yaml
index d9af86d2..cfdc209f 100644
--- a/.github/workflows/test-application.yaml
+++ b/.github/workflows/test-application.yaml
@@ -71,7 +71,7 @@ jobs:
             - name: Run php-cs-fixer
               if: ${{ matrix.php-cs-fixer }}
               run: |
-                  composer global require friendsofphp/php-cs-fixer --prefer-dist --no-interaction
+                  composer global require friendsofphp/php-cs-fixer:^2.19 --prefer-dist --no-interaction
                   GLOBAL_BIN_DIR=$(composer global config bin-dir --absolute --quiet)
                   $GLOBAL_BIN_DIR/php-cs-fixer fix --dry-run --diff
 
diff --git a/Search/Reindex/Provider/DoctrineOrmProvider.php b/Search/Reindex/Provider/DoctrineOrmProvider.php
index 88886777..bf46e21a 100644
--- a/Search/Reindex/Provider/DoctrineOrmProvider.php
+++ b/Search/Reindex/Provider/DoctrineOrmProvider.php
@@ -52,6 +52,9 @@ public function getClassFqns()
         $classFqns = [];
 
         foreach ($metadataFactory->getAllMetadata() as $classMetadata) {
+            if ($classMetadata->isMappedSuperclass) {
+                continue;
+            }
             if (null === $this->searchMetadataFactory->getMetadataForClass($classMetadata->name)) {
                 continue;
             }
diff --git a/Tests/Unit/Search/ReIndex/Provider/DoctrineOrmProviderTest.php b/Tests/Unit/Search/ReIndex/Provider/DoctrineOrmProviderTest.php
index ecdb2f34..3f995311 100644
--- a/Tests/Unit/Search/ReIndex/Provider/DoctrineOrmProviderTest.php
+++ b/Tests/Unit/Search/ReIndex/Provider/DoctrineOrmProviderTest.php
@@ -116,6 +116,29 @@ public function testClassFqns()
         $this->assertEquals(['stdClass'], $classFqns);
     }
 
+    /**
+     * It should return all the class fqns without the mapped superclass.
+     */
+    public function testClassFqnsMappedSuperClassNotReturned()
+    {
+        $this->ormMetadata->name = 'stdClass';
+        $mappedSuperClass = $this->prophesize(OrmClassMetadata::class);
+        $mappedSuperClass->name = 'stdClass2';
+        $mappedSuperClass->isMappedSuperclass = true;
+
+        $this->entityManager->getMetadataFactory()->willReturn($this->ormMetadataFactory->reveal());
+        $this->searchMetadataFactory->getMetadataForClass('stdClass')->willReturn($this->hierarchyMetadata->reveal());
+        $this->searchMetadataFactory->getMetadataForClass('stdClass2')->willReturn($mappedSuperClass->reveal());
+        $this->hierarchyMetadata->getOutsideClassMetadata()->willReturn($this->searchMetadata->reveal());
+        $this->ormMetadataFactory->getAllMetadata()->willReturn([
+            $this->ormMetadata->reveal(),
+            $mappedSuperClass->reveal(),
+        ]);
+
+        $classFqns = $this->provider->getClassFqns();
+        $this->assertEquals(['stdClass'], $classFqns);
+    }
+
     /**
      * It should not return class FQNs NOT managed by the search manager.
      */