diff --git a/src/app/entity-groups/iiif-entities/mirador-viewer/mirador-viewer.component.ts b/src/app/entity-groups/iiif-entities/mirador-viewer/mirador-viewer.component.ts
index 3a7f53536b..8e41c93572 100644
--- a/src/app/entity-groups/iiif-entities/mirador-viewer/mirador-viewer.component.ts
+++ b/src/app/entity-groups/iiif-entities/mirador-viewer/mirador-viewer.component.ts
@@ -42,7 +42,6 @@ export class MiradorViewerComponent implements OnInit {
    * or  multi-page thumbnail navigation.
    */
   setURL() {
-    const width = window.innerWidth;
     // The path to the REST manifest endpoint.
     const manifestApiEndpoint = encodeURIComponent(environment.rest.baseUrl + '/api/iiif/'
       + this.item.id + '/manifest');