diff --git a/.travis.yml b/.travis.yml
index f759c00..80a5abe 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,8 @@
 language: node_js
 node_js:
   - '0.10'
+  - '0.12'
+  - '4'
 install:
   - npm install
 after_success:
diff --git a/test/integration/server.js b/test/integration/server.js
index 4fb0cb8..9d9eb07 100644
--- a/test/integration/server.js
+++ b/test/integration/server.js
@@ -1271,12 +1271,13 @@ describe('Wallet service', function() {
       var requestPubKey = reqPrivKey.toPublicKey();
 
       var xPrivKey = TestData.copayers[0].xPrivKey_44H_0H_0H;
-      var sig = helpers.signRequestPubKey(requestPubKey, xPrivKey);
+      var requestPubKeyStr = requestPubKey.toString();
+      var sig = helpers.signRequestPubKey(requestPubKeyStr, xPrivKey);
 
       var copayerId = Model.Copayer._xPubToCopayerId(TestData.copayers[0].xPubKey_44H_0H_0H);
       opts = {
         copayerId: copayerId,
-        requestPubKey: requestPubKey,
+        requestPubKey: requestPubKeyStr,
         signature: sig,
       };
       ws = new WalletService();