diff --git a/web/viewer.js b/web/viewer.js
index 749117472..8474ef17a 100644
--- a/web/viewer.js
+++ b/web/viewer.js
@@ -3321,7 +3321,7 @@ window.addEventListener('keydown', function keydown(evt) {
       case 48: // '0'
       case 96: // '0' on Numpad of Swedish keyboard
         PDFView.parseScale(DEFAULT_SCALE, true);
-        handled = true;
+        handled = false; // keeping it unhandled (to restore page zoom to 100%)
         break;
     }
   }