diff --git a/certbot-ci/certbot_integration_tests/utils/acme_server.py b/certbot-ci/certbot_integration_tests/utils/acme_server.py
index fbf97fef1..697c17594 100755
--- a/certbot-ci/certbot_integration_tests/utils/acme_server.py
+++ b/certbot-ci/certbot_integration_tests/utils/acme_server.py
@@ -131,7 +131,7 @@ class ACMEServer(object):
         environ['PEBBLE_AUTHZREUSE'] = '100'
 
         self._launch_process(
-            [pebble_path, '-config', pebble_config_path, '-dnsserver', '127.0.0.1:8053'],
+            [pebble_path, '-config', pebble_config_path, '-dnsserver', '127.0.0.1:8053', '-strict'],
             env=environ)
 
         self._launch_process(