diff --git a/bundles/org.zikula.modulestudio.generator/src/org/zikula/modulestudio/generator/cartridges/symfony/controller/form/AutoCompletionRelationTransformer.xtend b/bundles/org.zikula.modulestudio.generator/src/org/zikula/modulestudio/generator/cartridges/symfony/controller/form/AutoCompletionRelationTransformer.xtend
index b7915f237..e8c1a986b 100644
--- a/bundles/org.zikula.modulestudio.generator/src/org/zikula/modulestudio/generator/cartridges/symfony/controller/form/AutoCompletionRelationTransformer.xtend
+++ b/bundles/org.zikula.modulestudio.generator/src/org/zikula/modulestudio/generator/cartridges/symfony/controller/form/AutoCompletionRelationTransformer.xtend
@@ -48,7 +48,7 @@ class AutoCompletionRelationTransformer {
             /**
              * Transforms a single object or a list of objects to a string with identifiers.
              */
-            public function transform($entities)
+            public function transform(mixed $entities): mixed
             {
                 $result = '';
                 if (null === $entities) {
@@ -78,7 +78,7 @@ class AutoCompletionRelationTransformer {
              *
              * @throws TransformationFailedException if entity is not found
              */
-            public function reverseTransform($value): mixed
+            public function reverseTransform(mixed $value): mixed
             {
                 if (!$value) {
                     return $this->isMultiple ? new ArrayCollection() : null;
diff --git a/bundles/org.zikula.modulestudio.generator/src/org/zikula/modulestudio/generator/cartridges/symfony/controller/form/UploadFileTransformer.xtend b/bundles/org.zikula.modulestudio.generator/src/org/zikula/modulestudio/generator/cartridges/symfony/controller/form/UploadFileTransformer.xtend
index 5a40779ad..642e8546b 100644
--- a/bundles/org.zikula.modulestudio.generator/src/org/zikula/modulestudio/generator/cartridges/symfony/controller/form/UploadFileTransformer.xtend
+++ b/bundles/org.zikula.modulestudio.generator/src/org/zikula/modulestudio/generator/cartridges/symfony/controller/form/UploadFileTransformer.xtend
@@ -52,7 +52,7 @@ class UploadFileTransformer {
             /**
              * Transforms a filename to the corresponding upload input array.
              */
-            public function transform($file)
+            public function transform(mixed $file): mixed
             {
                 return [
                     $this->fieldName => $file,
@@ -63,7 +63,7 @@ class UploadFileTransformer {
             /**
              * Transforms a result array back to the File object.
              */
-            public function reverseTransform($data): mixed
+            public function reverseTransform(mixed $data): mixed
             {
                 $deleteFile = false;
                 $uploadedFile = null;