diff --git a/php/src/Controller/DockerController.php b/php/src/Controller/DockerController.php
index 510c373b..26dc22a3 100644
--- a/php/src/Controller/DockerController.php
+++ b/php/src/Controller/DockerController.php
@@ -123,7 +123,7 @@ readonly class DockerController {
     }
 
     public function StartBackupContainerRestore(Request $request, Response $response, array $args) : Response {
-        $this->configurationManager->setMultiple(function ($confManager) use ($request) {
+        $this->configurationManager->setMultiple(function (ConfigurationManager $confManager) use ($request) {
             $confManager->backupMode = 'restore';
             $confManager->selectedRestoreTime = $request->getParsedBody()['selected_restore_time'] ?? '';
             $confManager->restoreExcludePreviews = isset($request->getParsedBody()['restore-exclude-previews']);
@@ -152,7 +152,7 @@ readonly class DockerController {
     }
 
     public function StartBackupContainerTest(Request $request, Response $response, array $args) : Response {
-        $this->configurationManager->setMultiple(function ($confManager) {
+        $this->configurationManager->setMultiple(function (ConfigurationManager $confManager) {
             $confManager->backupMode = 'test';
             $confManager->instance_restore_attempt = false;
         });
@@ -177,7 +177,7 @@ readonly class DockerController {
             $port = 443;
         }
 
-        $this->configurationManager->setMultiple(function ($confManager) use ($request, $host, $port, $path) {
+        $this->configurationManager->setMultiple(function (ConfigurationManager $confManager) use ($request, $host, $port, $path) {
             $confManager->install_latest_major = isset($request->getParsedBody()['install_latest_major']);
             // set AIO_URL
             $confManager->AIO_URL = $host . ':' . (string)$port . $path;
diff --git a/php/src/Data/ConfigurationManager.php b/php/src/Data/ConfigurationManager.php
index 19ff0b74..2fb0a413 100644
--- a/php/src/Data/ConfigurationManager.php
+++ b/php/src/Data/ConfigurationManager.php
@@ -419,7 +419,7 @@ class ConfigurationManager
             }
         }
 
-        $this->setMultiple(function ($confManager) use ($domain) {
+        $this->setMultiple(function (ConfigurationManager $confManager) use ($domain) {
             // Write domain
             // Don't set the domain via the attribute, or we create a loop.
             $confManager->set('domain', $domain);
@@ -441,7 +441,7 @@ class ConfigurationManager
      */
     public function SetBorgLocationVars(string $location, string $repo) : void {
         $this->ValidateBorgLocationVars($location, $repo);
-        $this->setMultiple(function ($confManager) use ($location, $repo) {
+        $this->setMultiple(function (ConfigurationManager $confManager) use ($location, $repo) {
             $confManager->borg_backup_host_location = $location;
             $confManager->borg_remote_repo = $repo;
         });
@@ -490,7 +490,7 @@ class ConfigurationManager
 
     public function DeleteBorgBackupLocationItems() : void {
         // Delete the variables
-        $this->setMultiple(function ($confManager) {
+        $this->setMultiple(function (ConfigurationManager $confManager) {
             $confManager->borg_backup_host_location = '';
             $confManager->borg_remote_repo = '';
         });
@@ -513,7 +513,7 @@ class ConfigurationManager
             throw new InvalidSettingConfigurationException("Please enter the password!");
         }
 
-        $this->setMultiple(function ($confManager) use ($location, $repo, $password) {
+        $this->setMultiple(function (ConfigurationManager $confManager) use ($location, $repo, $password) {
             $confManager->borg_backup_host_location = $location;
             $confManager->borg_remote_repo = $repo;
             $confManager->borg_restore_password = $password;
@@ -976,7 +976,7 @@ class ConfigurationManager
         if ($input === []) {
             return;
         }
-        $this->setMultiple(function($confManager) use ($input) {
+        $this->setMultiple(function(ConfigurationManager $confManager) use ($input) {
             foreach ($input as $variable) {
                 $keyWithValue = $confManager->replaceEnvPlaceholders($variable);
                 [$key, $value] = explode('=', $keyWithValue, 2);