diff --git a/src/www/authgui.inc b/src/www/authgui.inc
index 3a801df8a..ab3fca42e 100644
--- a/src/www/authgui.inc
+++ b/src/www/authgui.inc
@@ -53,9 +53,14 @@ function set_language()
     }
 
     $lang_encoding = $lang . '.UTF-8';
-    $textdomain = 'OPNsense';
 
     putenv('LANG=' . $lang_encoding);
+    putenv('LANGUAGE=' . $lang_encoding);
+    putenv('LC_ALL=' . $lang_encoding);
+    setlocale(LC_ALL, $lang_encoding);
+
+    $textdomain = 'OPNsense';
+
     textdomain($textdomain);
     bindtextdomain($textdomain, '/usr/local/share/locale');
     bind_textdomain_codeset($textdomain, $lang_encoding);