diff --git a/tests/auto/mainwindow/tst_mainwindow.cpp b/tests/auto/mainwindow/tst_mainwindow.cpp
index 9d5566529..b55b7f1ae 100644
--- a/tests/auto/mainwindow/tst_mainwindow.cpp
+++ b/tests/auto/mainwindow/tst_mainwindow.cpp
@@ -65,7 +65,8 @@ void tst_mainwindow::initTestCase() {
   QVERIFY2(m_storeDir.isValid(), "temp store dir must be created");
 
   // Minimal valid pass store: just a .gpg-id file
-  QFile gpgId(QDir::cleanPath(m_storeDir.path() + QStringLiteral("/.gpg-id")));
+  QFile gpgId(QDir::cleanPath(
+      QDir(m_storeDir.path()).filePath(QStringLiteral(".gpg-id"))));
   QVERIFY2(gpgId.open(QIODevice::WriteOnly), ".gpg-id must be writable");
   gpgId.write("0000000000000000\n");
   gpgId.close();