1 files changed, 1 insertions, 5 deletions
diff --git a/src/client/views/pdf/Annotation.tsx b/src/client/views/pdf/Annotation.tsx
index 2d8f47666..936af9ab8 100644
--- a/src/client/views/pdf/Annotation.tsx
+++ b/src/client/views/pdf/Annotation.tsx
@@ -52,11 +52,7 @@ class RegionAnnotation extends React.Component<IRegionAnnotationProps> {
 
         this._brushDisposer = reaction(
             () => FieldValue(Cast(this.props.document.group, Doc)) && Doc.isBrushedHighlightedDegree(FieldValue(Cast(this.props.document.group, Doc))!),
-            (brushed) => {
-                if (brushed !== undefined) {
-                    runInAction(() => this._brushed = brushed !== 0);
-                }
-            }
+            brushed => brushed !== undefined && runInAction(() => this._brushed = brushed !== 0)
         );
     }