diff --git a/tests/scripts/thread-cert/Cert_9_2_07_DelayTimer.py b/tests/scripts/thread-cert/Cert_9_2_07_DelayTimer.py
index 5d2c86143..d5d02a26a 100755
--- a/tests/scripts/thread-cert/Cert_9_2_07_DelayTimer.py
+++ b/tests/scripts/thread-cert/Cert_9_2_07_DelayTimer.py
@@ -87,8 +87,6 @@ class Cert_9_2_7_DelayTimer(unittest.TestCase):
         self.nodes[COMMISSIONER].start()
         time.sleep(5)
         self.assertEqual(self.nodes[COMMISSIONER].get_state(), 'router')
-        self.nodes[COMMISSIONER].commissioner_start()
-        time.sleep(20)
 
         self.nodes[ROUTER].start()
         time.sleep(10)