diff --git a/src/backends/x11/meta-seat-x11.c b/src/backends/x11/meta-seat-x11.c
index 058b52106..1461bb0b8 100644
--- a/src/backends/x11/meta-seat-x11.c
+++ b/src/backends/x11/meta-seat-x11.c
@@ -2575,14 +2575,6 @@ meta_seat_x11_translate_event (MetaSeatX11  *seat,
   return event;
 }
 
-ClutterInputDevice *
-meta_seat_x11_lookup_device_id (MetaSeatX11 *seat_x11,
-                                int          device_id)
-{
-  return g_hash_table_lookup (seat_x11->devices_by_id,
-                              GINT_TO_POINTER (device_id));
-}
-
 void
 meta_seat_x11_select_stage_events (MetaSeatX11  *seat,
                                    ClutterStage *stage)
diff --git a/src/backends/x11/meta-seat-x11.h b/src/backends/x11/meta-seat-x11.h
index 00f2b560a..7903960fc 100644
--- a/src/backends/x11/meta-seat-x11.h
+++ b/src/backends/x11/meta-seat-x11.h
@@ -35,8 +35,6 @@ MetaBackend * meta_seat_x11_get_backend (MetaSeatX11 *seat_x11);
 
 ClutterEvent * meta_seat_x11_translate_event (MetaSeatX11  *seat,
                                               XEvent       *xevent);
-ClutterInputDevice * meta_seat_x11_lookup_device_id (MetaSeatX11 *seat_x11,
-                                                     int          device_id);
 void meta_seat_x11_select_stage_events (MetaSeatX11  *seat,
                                         ClutterStage *stage);
 void meta_seat_x11_notify_devices (MetaSeatX11  *seat_x11,