diff --git a/unit_tests/test_zaza_charm_lifecycle_prepare.py b/unit_tests/test_zaza_charm_lifecycle_prepare.py
index 92ea511..510588b 100644
--- a/unit_tests/test_zaza_charm_lifecycle_prepare.py
+++ b/unit_tests/test_zaza_charm_lifecycle_prepare.py
@@ -8,7 +8,17 @@ class TestCharmLifecyclePrepare(ut_utils.BaseTestCase):
         self.patch_object(lc_prepare.subprocess, 'check_call')
         lc_prepare.add_model('newmodel')
         self.check_call.assert_called_once_with(
-            ['juju', 'add-model', 'newmodel'])
+            [
+                'juju', 'add-model', 'newmodel',
+                '--config', 'agent-stream=proposed',
+                '--config', 'default-series=xenial',
+                '--config', 'image-stream=daily',
+                '--config', 'test-mode=true',
+                '--config', 'transmit-vendor-metrics=false',
+                '--config', 'enable-os-upgrade=false',
+                '--config', 'automatically-retry-hooks=false',
+                '--config', 'use-default-secgroup=true'
+            ])
 
     def test_prepare(self):
         self.patch_object(lc_prepare, 'add_model')
diff --git a/zaza/charm_lifecycle/prepare.py b/zaza/charm_lifecycle/prepare.py
index 0f0e436..00e6002 100644
--- a/zaza/charm_lifecycle/prepare.py
+++ b/zaza/charm_lifecycle/prepare.py
@@ -4,6 +4,22 @@ import subprocess
 import sys
 
 
+MODEL_DEFAULTS = [
+    # Model defaults from charm-test-infra
+    #   https://jujucharms.com/docs/2.1/models-config
+    '--config', 'agent-stream=proposed',
+    '--config', 'default-series=xenial',
+    '--config', 'image-stream=daily',
+    '--config', 'test-mode=true',
+    '--config', 'transmit-vendor-metrics=false',
+    # https://bugs.launchpad.net/juju/+bug/1685351
+    # enable-os-refresh-update: false
+    '--config', 'enable-os-upgrade=false',
+    '--config', 'automatically-retry-hooks=false',
+    '--config', 'use-default-secgroup=true',
+]
+
+
 def add_model(model_name):
     """Add a model with the given name
 
@@ -11,7 +27,7 @@ def add_model(model_name):
     :type bundle: str
     """
     logging.info("Adding model {}".format(model_name))
-    subprocess.check_call(['juju', 'add-model', model_name])
+    subprocess.check_call(['juju', 'add-model', model_name] + MODEL_DEFAULTS)
 
 
 def prepare(model_name):