diff --git a/tests/scripts/thread-cert/Cert_5_3_07_DuplicateAddress.py b/tests/scripts/thread-cert/Cert_5_3_07_DuplicateAddress.py
index 7403906d0..2bf1a21da 100755
--- a/tests/scripts/thread-cert/Cert_5_3_07_DuplicateAddress.py
+++ b/tests/scripts/thread-cert/Cert_5_3_07_DuplicateAddress.py
@@ -117,9 +117,6 @@ class Cert_5_3_7_DuplicateAddress(unittest.TestCase):
         self.nodes[ED2].add_ipaddr('2001::1')
         time.sleep(3)
 
-        # Harness assumes nodes will autoconfigure addresses on all prefixes,
-        # but manually configuring for now until spinel-cli does this.
-        self.nodes[ED3].add_ipaddr('2001::3')
         self.nodes[ED3].ping('2001::1')
 
 if __name__ == '__main__':