diff --git a/src/Registry/Nlsconfig.php b/src/Registry/Nlsconfig.php
index 6ad11eac..4c7146c9 100644
--- a/src/Registry/Nlsconfig.php
+++ b/src/Registry/Nlsconfig.php
@@ -18,6 +18,7 @@
 
 use Horde\Core\Config\BackendConfigLoader;
 use Horde\Core\LanguageContext;
+use Horde\Core\LanguageContextSelector;
 use Horde\Core\Session\SessionAccess;
 use Horde_Prefs;
 
@@ -87,10 +88,10 @@ public function preferredLang(?string $lang = null): string
             return basename($lang);
         }
 
-        if (!empty($serverEnvironment)) {
+        if (!empty($this->serverEnvironment)) {
             $partialLang = null;
 
-            foreach (explode(',', $serverEnvironment) as $browserLang) {
+            foreach (explode(',', $this->serverEnvironment) as $browserLang) {
                 if (($pos = strpos($browserLang, ';')) !== false) {
                     $browserLang = substr($browserLang, 0, $pos);
                 }
diff --git a/test/Unit/Registry/NlsconfigTest.php b/test/Unit/Registry/NlsconfigTest.php
index 29a1dea8..0339635e 100644
--- a/test/Unit/Registry/NlsconfigTest.php
+++ b/test/Unit/Registry/NlsconfigTest.php
@@ -81,7 +81,7 @@ protected function tearDown(): void
 
     private function makeNlsconfig(): Nlsconfig
     {
-        return new Nlsconfig($this->sessionAccessor, $this->configLoader);
+        return new Nlsconfig($this->configLoader, null, $this->sessionAccessor);
     }
 
     public function testImplementsLanguageContext(): void