diff --git a/src/xdisp.c b/src/xdisp.c
index f6f75f321c..8b091c81be 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -32390,7 +32390,9 @@ expose_window (struct window *w, XRectangle *fr)
 static bool
 expose_window_tree (struct window *w, XRectangle *r)
 {
+#ifndef HAVE_NS
   struct frame *f = XFRAME (w->frame);
+#endif
   bool mouse_face_overwritten_p = false;
 
   /* NS toolkits may have aleady modified the frame in expectation of