diff --git a/package.json b/package.json
index 9cd6b7c..754a876 100644
--- a/package.json
+++ b/package.json
@@ -51,10 +51,11 @@
     "libp2p-tcp": "~0.10.0",
     "libp2p-webrtc-star": "~0.9.0",
     "libp2p-websockets": "~0.10.0",
+    "peer-book": "~0.4.0",
     "pre-commit": "^1.2.2",
     "pull-goodbye": "0.0.1",
-    "peer-book": "~0.4.0",
     "pull-stream": "^3.5.0",
+    "sinon": "^2.1.0",
     "webrtcsupport": "^2.2.0"
   },
   "dependencies": {
diff --git a/src/index.js b/src/index.js
index 57f64e7..e4b980f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -11,6 +11,8 @@ const protocolMuxer = require('./protocol-muxer')
 const plaintext = require('./plaintext')
 const assert = require('assert')
 
+const DEFAULT_TRANSPORT_PRIORITY = 1
+
 exports = module.exports = Swarm
 
 util.inherits(Swarm, EE)
@@ -63,6 +65,12 @@ function Swarm (peerInfo, peerBook) {
 
     // Only listen on transports we actually have addresses for
     return myTransports.filter((ts) => this.transports[ts].filter(myAddrs).length > 0)
+      .sort((a, b) => {
+        let pRa = a.priority || DEFAULT_TRANSPORT_PRIORITY
+        let pRb = b.priority || DEFAULT_TRANSPORT_PRIORITY
+
+        return pRa - pRb
+      })
   }
 
   // higher level (public) API