diff --git a/src/plugins/platforms/wayland/qwaylandwlshellsurface.cpp b/src/plugins/platforms/wayland/qwaylandwlshellsurface.cpp
index cd10958d94a..185cfc4a9c4 100644
--- a/src/plugins/platforms/wayland/qwaylandwlshellsurface.cpp
+++ b/src/plugins/platforms/wayland/qwaylandwlshellsurface.cpp
@@ -192,7 +192,7 @@ void QWaylandWlShellSurface::updateTransientParent(QWindow *parent)
                   flags);
 }
 
-void QWaylandWlShellSurface::setPopup(QWaylandWindow *parent, QWaylandInputDevice *device, int serial)
+void QWaylandWlShellSurface::setPopup(QWaylandWindow *parent, QWaylandInputDevice *device, uint serial)
 {
     QWaylandWindow *parent_wayland_window = parent;
     if (!parent_wayland_window) {
diff --git a/src/plugins/platforms/wayland/qwaylandwlshellsurface_p.h b/src/plugins/platforms/wayland/qwaylandwlshellsurface_p.h
index 94e3417a412..62583949b68 100644
--- a/src/plugins/platforms/wayland/qwaylandwlshellsurface_p.h
+++ b/src/plugins/platforms/wayland/qwaylandwlshellsurface_p.h
@@ -102,7 +102,7 @@ private:
 
     void setTopLevel();
     void updateTransientParent(QWindow *parent);
-    void setPopup(QWaylandWindow *parent, QWaylandInputDevice *device, int serial);
+    void setPopup(QWaylandWindow *parent, QWaylandInputDevice *device, uint serial);
 
     QWaylandWindow *m_window;
     bool m_maximized;