diff --git a/lib/core/src/lib/viewer/components/pdf-viewer.component.html b/lib/core/src/lib/viewer/components/pdf-viewer.component.html
index 4801497bbe..c1c4418f20 100644
--- a/lib/core/src/lib/viewer/components/pdf-viewer.component.html
+++ b/lib/core/src/lib/viewer/components/pdf-viewer.component.html
@@ -107,6 +107,7 @@
 
         <button
             id="viewer-scale-page-button"
+            role="button" aria-pressed="true"
             title="{{ 'ADF_VIEWER.ARIA.FIT_PAGE' | translate }}"
             attr.aria-label="{{ 'ADF_VIEWER.ARIA.FIT_PAGE' | translate }}"
             mat-icon-button