diff --git a/apps/contourclock/app.js b/apps/contourclock/app.js
index bf93ae5ba..b88c5817d 100644
--- a/apps/contourclock/app.js
+++ b/apps/contourclock/app.js
@@ -9,9 +9,17 @@
     settings.hide=false;
     settings.weekday=true;
     settings.hideWhenLocked=false;
-    settings.date=true;    require('Storage').writeJSON("myapp.json", settings);
+    settings.date=true;    
+    require('Storage').writeJSON("contourclock.json", settings);
+  }
+  let installedFonts = require('Storage').readJSON("contourclock-install.json") || {};
+  if (installedFonts.n>0) { //New install - check for unused font files
+    for (let n=installedFonts.n; ;n++) { 
+      if (require("Storage").read("contourclock-"+n+".json")==undefined) break;
+      require("Storage").erase("contourclock-"+n+".json");
+    }
+    require("Storage").erase("contourclock-install.json");
   }
-
   let queueDraw = function() {
     if (drawTimeout) clearTimeout(drawTimeout);
     drawTimeout = setTimeout(function() {
@@ -20,7 +28,6 @@
       queueDraw();
     }, 60000 - (Date.now() % 60000));
   };
-
   let draw = function() {
     var date = new Date();
     // Draw day of the week
@@ -37,10 +44,8 @@
     }
     require('contourclock').drawClock(settings.fontIndex);
   };
-  
   require("FontTeletext10x18Ascii").add(Graphics);
   g.clear();
-  
   draw();
   if (settings.hideWhenLocked) Bangle.on('lock', function (locked) {
     if (!locked) require("widget_utils").show();