diff --git a/cmd/gtkplayer/main.go b/cmd/gtkplayer/main.go
index ee7542c..cabe52a 100644
--- a/cmd/gtkplayer/main.go
+++ b/cmd/gtkplayer/main.go
@@ -219,11 +219,7 @@ func getWindowID(w *gdk.Window) uint64 {
 
 // gdkWindowGetXID extracts the XID from a GDK window when running on X11.
 func gdkWindowGetXID(w *gdk.Window) uint {
-	type xidGetter interface {
-		GetXID() uint
-	}
-	if xw, ok := w.(xidGetter); ok {
-		return xw.GetXID()
-	}
+	// gotk3 provides this method on GDK windows under X11
+	return w.GetXID()
 	return 0
 }