diff --git a/sddmauthhelper.cpp b/sddmauthhelper.cpp
index c8682ee..f8b165a 100644
--- a/sddmauthhelper.cpp
+++ b/sddmauthhelper.cpp
@@ -36,6 +36,8 @@
 #include <KUser>
 #include <KZip>
 
+#include "src/config.h"
+
 static QSharedPointer<KConfig> openConfig(const QString &filePath)
 {
     QFile file(filePath);
@@ -212,8 +214,8 @@ ActionReply SddmAuthHelper::reset(const QVariantMap &args)
 ActionReply SddmAuthHelper::save(const QVariantMap &args)
 {
     ActionReply reply = ActionReply::HelperErrorReply();
-    QSharedPointer<KConfig> sddmConfig = openConfig(args[QStringLiteral("kde_settings.conf")].toString());
-    QSharedPointer<KConfig> sddmOldConfig = openConfig(args[QStringLiteral("sddm.conf")].toString());
+    QSharedPointer<KConfig> sddmConfig = openConfig(QStringLiteral(SDDM_CONFIG_DIR "/kde.conf"));
+    QSharedPointer<KConfig> sddmOldConfig = openConfig(QStringLiteral(SDDM_CONFIG_FILE));
     QSharedPointer<KConfig> themeConfig;
     QString themeConfigFile = args[QStringLiteral("theme.conf.user")].toString();