diff --git a/src/widgets/aooptionsdialog.cpp b/src/widgets/aooptionsdialog.cpp
index 8b7befe..38db445 100644
--- a/src/widgets/aooptionsdialog.cpp
+++ b/src/widgets/aooptionsdialog.cpp
@@ -176,7 +176,7 @@ void AOOptionsDialog::updateValues()
 
   for (const QString &base : bases) {
     QStringList l_themes =
-        QDir(base + "themes").entryList(QDir::Dirs | QDir::NoDotAndDotDot);
+        QDir(base + "/themes").entryList(QDir::Dirs | QDir::NoDotAndDotDot);
 
     // Resorts list to match numeric sorting found in Windows.
     QCollator l_sorting;