diff --git a/index.js b/index.js
index d5494ff..21867dc 100644
--- a/index.js
+++ b/index.js
@@ -399,6 +399,10 @@ function Client (peerId, port, torrent, opts) {
   self._numWant = self._opts.numWant || 80
   self._intervalMs = self._opts.interval || (30 * 60 * 1000) // default: 30 minutes
 
+  if (typeof torrent.announce === 'string') {
+    // magnet-uri returns a string if the magnet uri only contains one 'tr' parameter
+    torrent.announce = [torrent.announce]
+  }
   self._trackers = torrent.announce.map(function (announceUrl) {
     return new Tracker(self, announceUrl, self._opts)
   })
diff --git a/test/client-large-torrent.js b/test/client-large-torrent.js
index 62c5f03..c21950b 100644
--- a/test/client-large-torrent.js
+++ b/test/client-large-torrent.js
@@ -11,7 +11,7 @@ var port = 6881
 // remove all tracker servers except a single UDP one, for now
 parsedTorrent.announce = [ 'udp://tracker.publicbt.com:80/announce' ]
 
-test('client.start()', function (t) {
+test('large torrent: client.start()', function (t) {
   t.plan(4)
 
   var client = new Client(peerId, port, parsedTorrent)