diff --git a/sddmauthhelper.cpp b/sddmauthhelper.cpp
--- a/sddmauthhelper.cpp
+++ b/sddmauthhelper.cpp
@@ -224,8 +224,11 @@
     return ActionReply::SuccessReply();
 }
 
+int main(int argc, char **argv) {
+    qputenv("LANG", "C.UTF-8");
+    return KAuth::HelperSupport::helperMain(argc, argv, "org.kde.kcontrol.kcmsddm", new SddmAuthHelper());
+}
 
-KAUTH_HELPER_MAIN("org.kde.kcontrol.kcmsddm", SddmAuthHelper);
 
 #include "moc_sddmauthhelper.cpp"