diff --git a/apps/contourclock/custom.html b/apps/contourclock/custom.html
index f290fd8f7..eddeab078 100644
--- a/apps/contourclock/custom.html
+++ b/apps/contourclock/custom.html
@@ -56,7 +56,7 @@
           }
         }
         if (n>0) {
-          fonts.push({name:"contourclock-install.json", content:n});
+          fonts.push({name:"contourclock-install.json", content:""+n});
           sendCustomizedApp({storage:fonts});
         } else {
           alert("Please select at least one Font!");