diff --git a/js/ui/magnifier.js b/js/ui/magnifier.js
index 953277dd9..d7d3506a5 100644
--- a/js/ui/magnifier.js
+++ b/js/ui/magnifier.js
@@ -745,8 +745,7 @@ var ZoomRegion = class ZoomRegion {
         this._xCaret = 0;
         this._yCaret = 0;
 
-        let seat = Clutter.get_default_backend().get_default_seat();
-        this._pointerIdleMonitor = Meta.IdleMonitor.get_for_device(seat.get_pointer());
+        this._pointerIdleMonitor = Meta.IdleMonitor.get_core();
         this._scrollContentsTimerId = 0;
     }