diff --git a/runbot/models/build.py b/runbot/models/build.py
index 65c884ab8..8ec6d26e8 100644
--- a/runbot/models/build.py
+++ b/runbot/models/build.py
@@ -1021,7 +1021,9 @@ def _docker_run(self, step, cmd=None, ro_volumes=None, env_variables=None, **kwa
 
         containers_memory_limit = self.env['ir.config_parameter'].sudo().get_param('runbot.runbot_containers_memory', 0)
         if containers_memory_limit and 'memory' not in kwargs:
-            kwargs['memory'] = int(float(containers_memory_limit) * 1024 ** 3)
+            memory_limit_factor = float(self.params_id.config_data.get('memory_limit_factor', 1))
+            containers_memory_limit = int(float(containers_memory_limit) * 1024 ** 3) * memory_limit_factor
+            kwargs['memory'] = containers_memory_limit
 
         self.docker_start = now()
         if self.job_start:
diff --git a/runbot/tests/test_build_config_step.py b/runbot/tests/test_build_config_step.py
index 063c318ec..e18a865c6 100644
--- a/runbot/tests/test_build_config_step.py
+++ b/runbot/tests/test_build_config_step.py
@@ -1185,22 +1185,15 @@ def test_network_can_be_enable(self, mock_checkout):
             'job_type': 'install_odoo',
         })
 
-        # by default, network is disabled
-        def first_docker_run(cmd, log_path, *args, **kwargs):
-            self.assertFalse(kwargs['network_enabled'])
-
-        self.docker_run_patch = first_docker_run
         config_step._run_step(self.parent_build)()
-
-        def second_docker_run(cmd, log_path, *args, **kwargs):
-            self.assertTrue(kwargs['network_enabled'])
-
-        self.docker_run_patch = second_docker_run
+        self.assertFalse(self.docker_run_calls[0][3]['network_enabled'])
 
         parent_build_params = self.parent_build.params_id.copy({'config_data': {'network_enabled': True}})
         parent_build = self.parent_build.copy({'params_id': parent_build_params.id})
         config_step._run_step(parent_build)()
 
+        self.assertTrue(self.docker_run_calls[1][3]['network_enabled'])
+
 
     @patch('odoo.addons.runbot.models.build.BuildResult._checkout')
     def test_run_python_networkcan_be_enabled(self, mock_checkout):
@@ -1241,6 +1234,21 @@ def test_install_custom_parametric_tags(self, mock_checkout, parse_config):
         tags = self.get_test_tags(params)
         self.assertEqual(tags, '"-at_install,/web/foo.py:WebSuite.test_unit_desktop[@bar/test with spaces],-/web/bar.py[@snafu/other test with spaces]"')
 
+        @patch('odoo.addons.runbot.models.build.BuildResult._checkout')
+        def test_memory_limit(self, mock_checkout):
+            """ test that network can be disabled with config_data """
+            config_step = self.ConfigStep.create({
+                'name': 'default',
+                'job_type': 'install_odoo',
+            })
+            self.env['ir.config_parameter'].sudo().set_param('runbot.runbot_containers_memory', 10)
+            config_step._run_step(self.parent_build)()
+            self.assertEqual(self.docker_run_calls[0][3]['memory'], 10 * 1024 ** 3)
+
+            parent_build_params = self.parent_build.params_id.copy({'config_data': {'memory_limit_factor': 0.9}})
+            parent_build = self.parent_build.copy({'params_id': parent_build_params.id})
+            config_step._run_step(parent_build)()
+            self.assertEqual(self.docker_run_calls[1][3]['memory'], 9 * 1024 ** 3)
 class TestMakeResult(RunbotCase):
 
     def setUp(self):