diff --git a/tester.py b/tester.py
index 5366f6845b02efbc61865b501f2201e35c79935c..cadedaaeda687aa9653671e94dac06568ad777a6 100755
--- a/tester.py
+++ b/tester.py
@@ -253,6 +253,9 @@ class Tester():
             if os.path.exists(ms_path):
                 log('Updating ms-testing-suite in "%s".' % ms_path)
                 os.chdir(ms_path)
+                branch = utils.get_conf('ENVSETUP_BRANCH') or 'stable'
+                if branch:
+                    subprocess.call(['git', 'checkout', branch])
                 subprocess.call(['git', 'pull', '--recurse-submodules'])
                 subprocess.call(['git', 'submodule', 'update', '--init', '--recursive'])
                 os.chdir(self.root_dir)