diff --git a/apps/red-ui/src/app/modules/dossier/services/annotation-actions.service.ts b/apps/red-ui/src/app/modules/dossier/services/annotation-actions.service.ts
index 32d5004e0..c658450b6 100644
--- a/apps/red-ui/src/app/modules/dossier/services/annotation-actions.service.ts
+++ b/apps/red-ui/src/app/modules/dossier/services/annotation-actions.service.ts
@@ -405,7 +405,7 @@ export class AnnotationActionsService {
 
         const document = await viewer.Core.documentViewer.getDocument().getPDFDoc();
         const page = await document.getPage(viewerAnnotation.getPageNumber());
-        if (viewerAnnotation instanceof Core.Annotations.TextHighlightAnnotation) {
+        if (viewerAnnotation instanceof viewer.Core.Annotations.TextHighlightAnnotation) {
             const words = [];
             const rectangles: IRectangle[] = [];
             for (const quad of viewerAnnotation.Quads) {