diff --git a/index.js b/index.js
index f6fcb415..bb3d5ab9 100644
--- a/index.js
+++ b/index.js
@@ -194,6 +194,7 @@ WebTorrent.prototype.seed = function (input, opts, onseed) {
     onseed = opts
     opts = {}
   }
+  opts = opts || {}
 
   // TODO: support `input` as string, or array of strings