diff --git a/Classes/Driver/Version6/Mapping/NodeTypeMappingBuilder.php b/Classes/Driver/Version6/Mapping/NodeTypeMappingBuilder.php
index 7736116c..4e81a485 100644
--- a/Classes/Driver/Version6/Mapping/NodeTypeMappingBuilder.php
+++ b/Classes/Driver/Version6/Mapping/NodeTypeMappingBuilder.php
@@ -73,8 +73,10 @@ public function buildMappingInformation(ContentRepositoryId $contentRepositoryId
 
             $propertiesAndReferences = array_merge(
                 $nodeType->getProperties(),
-                array_map(function ($reference) {
-                    $reference['type'] = 'references';
+                array_map(static function (array $reference): array {
+                    $reference['type'] = (($reference['constraints']['maxItems'] ?? null) === 1)
+                        ? 'reference'
+                        : 'references';
                     return $reference;
                 }, $nodeType->getReferences())
             );