diff --git a/app/mainwindow.cpp b/app/mainwindow.cpp
index 3575679..d47be05 100644
--- a/app/mainwindow.cpp
+++ b/app/mainwindow.cpp
@@ -300,7 +300,7 @@ void MainWindow::mouseReleaseEvent(QMouseEvent *event)
     // Reference:
     // [1]: https://codereview.qt-project.org/c/qt/qtbase/+/177475
     if (event->button() == Qt::ForwardButton || event->button() == Qt::BackButton) {
-        event->button() == Qt::BackButton ? galleryNext() : galleryPrev();
+        event->button() == Qt::BackButton ? galleryPrev() : galleryNext();
         event->accept();
     }