diff --git a/tests_authentic/settings.py b/tests_authentic/settings.py
index e167ddc..4a8e4c3 100644
--- a/tests_authentic/settings.py
+++ b/tests_authentic/settings.py
@@ -9,7 +9,7 @@ DEBUG = False
 PROJECT_NAME = 'authentic2-multitenant'
 
 
-with patch.object(builtin, 'file', mock_open(read_data='xxx')):
+with patch.object(builtin, 'open', mock_open(read_data='xxx')):
     execfile(os.environ['DEBIAN_CONFIG_COMMON'])
 
 BRANCH_NAME = os.environ.get("BRANCH_NAME", "").replace('/', '-')
diff --git a/tests_multitenant/settings.py b/tests_multitenant/settings.py
index 20af7a7..8e56a2d 100644
--- a/tests_multitenant/settings.py
+++ b/tests_multitenant/settings.py
@@ -40,7 +40,7 @@ TEMPLATES = [
 ]
 
 
-with patch.object(builtin, 'file', mock_open(read_data='xxx')):
+with patch.object(builtin, 'open', mock_open(read_data='xxx')):
     execfile(os.path.join(os.path.dirname(__file__), '../debian/debian_config_common.py'))
 
 BRANCH_NAME = os.environ.get("BRANCH_NAME", "").replace('/', '-')
diff --git a/tests_passerelle/settings.py b/tests_passerelle/settings.py
index 469f751..0f8ddd0 100644
--- a/tests_passerelle/settings.py
+++ b/tests_passerelle/settings.py
@@ -11,7 +11,7 @@ PROJECT_NAME = 'passerelle'
 #
 # hobotization (multitenant)
 #
-with patch.object(builtin, 'file', mock_open(read_data='xxx')):
+with patch.object(builtin, 'open', mock_open(read_data='xxx')):
     execfile(os.environ['DEBIAN_CONFIG_COMMON'])
 
 BRANCH_NAME = os.environ.get("BRANCH_NAME", "").replace('/', '-')