diff --git a/lib/branch.js b/lib/branch.js
index 5901a73..d879cc7 100644
--- a/lib/branch.js
+++ b/lib/branch.js
@@ -25,6 +25,6 @@ module.exports = function (branch, opt, cb) {
   return exec(cmd, {cwd: opt.cwd, maxBuffer: maxBuffer}, function(err, stdout, stderr) {
     if (err) return cb(err);
     if (!opt.quiet) gutil.log(stdout, stderr);
-    cb();
+    cb(null, stdout);
   });
 };