diff --git a/src/components/MapViewer/MenuWidget.jsx b/src/components/MapViewer/MenuWidget.jsx
index d165f04c..78629cda 100644
--- a/src/components/MapViewer/MenuWidget.jsx
+++ b/src/components/MapViewer/MenuWidget.jsx
@@ -796,6 +796,8 @@ class MenuWidget extends React.Component {
               );
               if (layerOpacities[id]) {
                 element.dataset.opacity = layerOpacities[id] * 100;
+              } else {
+                element.dataset.opacity = 100;
               }
             }
           });