diff --git a/hw/xwayland/xwayland-window.c b/hw/xwayland/xwayland-window.c
index 09d69df3c..d419e3070 100644
--- a/hw/xwayland/xwayland-window.c
+++ b/hw/xwayland/xwayland-window.c
@@ -246,7 +246,7 @@ unregister_damage(WindowPtr window)
     dixSetPrivate(&window->devPrivates, &xwl_damage_private_key, NULL);
 }
 
-Bool
+static Bool
 xwl_window_has_viewport_enabled(struct xwl_window *xwl_window)
 {
     return (xwl_window->viewport != NULL);
diff --git a/hw/xwayland/xwayland-window.h b/hw/xwayland/xwayland-window.h
index 2873ab707..08629877f 100644
--- a/hw/xwayland/xwayland-window.h
+++ b/hw/xwayland/xwayland-window.h
@@ -85,7 +85,6 @@ Bool is_surface_from_xwl_window(struct wl_surface *surface);
 
 void xwl_window_update_property(struct xwl_window *xwl_window,
                                 PropertyStateRec *propstate);
-Bool xwl_window_has_viewport_enabled(struct xwl_window *xwl_window);
 Bool xwl_window_is_toplevel(WindowPtr window);
 void xwl_window_check_resolution_change_emulation(struct xwl_window *xwl_window);
 void xwl_window_rootful_update_title(struct xwl_window *xwl_window);