diff --git a/lib/db.js b/lib/db.js
index f11f2fe..b7e3104 100644
--- a/lib/db.js
+++ b/lib/db.js
@@ -19,7 +19,7 @@ module.exports = class DB {
       for (sid of Object.keys(this.db)) {
         for (f of this.db[sid]) {
           // no removal of one-time downloads
-          if(!Number.isInteger(f.metadata.retention)) return;
+          if(!Number.isInteger(+f.metadata.retention)) return;
 
           expires = (+f.metadata.createdAt) + (+f.metadata.retention * 1000) - Date.now();
           if(expires <= 0) {