diff --git a/bin/next-build-tools.js b/bin/next-build-tools.js
index 7ef80d9a..5fe03c2d 100755
--- a/bin/next-build-tools.js
+++ b/bin/next-build-tools.js
@@ -161,7 +161,8 @@ program
 program
 	.command('run')
 	.description('Runs the local app through the router')
-	.option('-l, --local', 'Run the app but don\'t start the router ')
+	.option('-l, --local', 'Run the app but don\'t start the router')
+	.option('--harmony', 'Runs the local app with harmony')
 	.action(function(opts){
 		run(opts).catch(exit);
 	});
diff --git a/tasks/run.js b/tasks/run.js
index baf5bf71..0edfd302 100644
--- a/tasks/run.js
+++ b/tasks/run.js
@@ -18,7 +18,11 @@ function runLocal(opts) {
 	return new Promise(function(resolve, reject) {
 		var env = Object.create(process.env);
 		env.PORT = port;
-		var local = spawn('nodemon', ['server/app.js', '--watch server'], { cwd: process.cwd(), env: env });
+		var args = ['server/app.js', '--watch server'];
+		if (opts.harmony) {
+			args.push('--harmony');
+		}
+		var local = spawn('nodemon', args, { cwd: process.cwd(), env: env });
 
 		local.stdout.on('data', toStdOut);
 		local.stderr.on('data', toStdErr);