diff --git a/cmd/gtkplayer/main.go b/cmd/gtkplayer/main.go
index cabe52a..f359a7b 100644
--- a/cmd/gtkplayer/main.go
+++ b/cmd/gtkplayer/main.go
@@ -220,6 +220,6 @@ func getWindowID(w *gdk.Window) uint64 {
 // gdkWindowGetXID extracts the XID from a GDK window when running on X11.
 func gdkWindowGetXID(w *gdk.Window) uint {
 	// gotk3 provides this method on GDK windows under X11
-	return w.GetXID()
+	return uint(w.GetXID())
 	return 0
 }