diff --git a/Classes/Backend/LayoutSetup.php b/Classes/Backend/LayoutSetup.php
index 1d24d4d..e68c9f9 100644
--- a/Classes/Backend/LayoutSetup.php
+++ b/Classes/Backend/LayoutSetup.php
@@ -750,7 +750,7 @@ public function getLanguageService(): LanguageService
      *
      * @param LanguageService|null $languageService
      */
-    public function setLanguageService(LanguageService $languageService = null): void
+    public function setLanguageService(?LanguageService $languageService = null): void
     {
         if ($languageService instanceof LanguageService) {
             $this->languageService = $languageService;
diff --git a/Classes/Plugin/Gridelements.php b/Classes/Plugin/Gridelements.php
index d9d336d..48feb21 100644
--- a/Classes/Plugin/Gridelements.php
+++ b/Classes/Plugin/Gridelements.php
@@ -174,7 +174,7 @@ public function main(string $content = '', array $conf = []): string
      * @param array|null $child
      * @deprecated use the recommended static file based on DataProcessing instead of a USER cObject, will be removed in Gridelements v11.0
      */
-    public function initPluginFlexForm(string $field = 'pi_flexform', array &$child = null)
+    public function initPluginFlexForm(string $field = 'pi_flexform', ?array &$child = null)
     {
         $this->flexFormTools = GeneralUtility::makeInstance(FlexFormTools::class);
         // Converting flexform data into array: