--- a/src/auth/Auth.cpp
+++ b/src/auth/Auth.cpp
@@ -129,7 +129,9 @@ namespace SDDM {
                 QStringList parts = in.readLine().split(QLatin1Char('='));
                 if (parts.size() >= 2) {
                     env.insert(parts[0], parts[1]);
-                    if (parts[0] == QLatin1String("LANG"))
+                    if (parts[0] == QLatin1String("LANG") &&
+                        (parts[1].startsWith(QStringLiteral("ru_"), Qt::CaseInsensitive) ||
+                         parts[1].startsWith(QStringLiteral("en_"), Qt::CaseInsensitive)))
                         langEmpty = false;
                 }
             }