1 files changed, 2 insertions, 2 deletions
diff --git a/src/client/util/TrackMovements.ts b/src/client/util/TrackMovements.ts
index 0e56ee1bc..0b197cf9a 100644
--- a/src/client/util/TrackMovements.ts
+++ b/src/client/util/TrackMovements.ts
@@ -1,4 +1,4 @@
-import { IReactionDisposer, observable, observe, reaction } from 'mobx';
+import { IReactionDisposer, makeObservable, observable, observe, reaction } from 'mobx';
 import { NumCast } from '../../fields/Types';
 import { Doc, DocListCast } from '../../fields/Doc';
 import { CollectionDockingView } from '../views/collections/CollectionDockingView';
@@ -40,7 +40,7 @@ export class TrackMovements {
     constructor() {
         // init the global instance
         TrackMovements._instance = this;
-
+        makeObservable(this);
         // init the instance variables
         this.currentPresentation = TrackMovements.NULL_PRESENTATION;
         this.tracking = false;