diff --git a/lib/server.js b/lib/server.js
index b508368..0488241 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -1396,7 +1396,7 @@ WalletService.prototype.getPendingTxs = function(opts, cb) {
         return _.startsWith(txp.version, '1.');
       });
 
-      if (!allLegacy) return cb(new Error('Some spend proposals were created using a newer version. Please upgrade your client app.'))
+      if (!allLegacy) return cb(new ClientError('UPGRADENEEDED', 'Some spend proposals were created using a newer version of the client app'));
     }
 
     _.each(txps, function(txp) {
diff --git a/test/integration/server.js b/test/integration/server.js
index 1df33a5..70e89eb 100644
--- a/test/integration/server.js
+++ b/test/integration/server.js
@@ -4309,7 +4309,8 @@ describe('Wallet service', function() {
               server.getPendingTxs({}, function(err, txps) {
                 should.exist(err);
                 should.not.exist(txps);
-                err.toString().should.contain('created by a newer version');
+                err.code.should.equal('UPGRADENEEDED');
+                err.message.should.contain('newer version');
                 done();
               });
             });