diff --git a/apps/shadowclk/app.js b/apps/shadowclk/app.js
index 64c86908a..56f8bb196 100644
--- a/apps/shadowclk/app.js
+++ b/apps/shadowclk/app.js
@@ -84,6 +84,9 @@ Graphics.prototype.setFontLondrinaSolid = function() {
       remove: function() {
         if (drawTimeout) clearTimeout(drawTimeout);
         drawTimeout = undefined;
+        delete Graphics.prototype.setFontLondrinaSolid;
+        delete Graphics.prototype.setFontLondrinaShadow;
+        delete Graphics.prototype.setFontDotGothic16;
       }
     });
     Bangle.loadWidgets();