diff --git a/roles/bootstrap/molecule/default/tests/test_parameters_mandatory.py b/roles/bootstrap/molecule/default/tests/test_parameters_mandatory.py
index f62b306a52a5d47d7dd3941686a30744becdc33e..466990b6b47ece302b2ba6fd7318c8aa15335b1b 100644
--- a/roles/bootstrap/molecule/default/tests/test_parameters_mandatory.py
+++ b/roles/bootstrap/molecule/default/tests/test_parameters_mandatory.py
@@ -14,7 +14,7 @@ def test_authorized_keys(host):
 
     with host.sudo():
 
-        ssh_key = open(os.path.expanduser('~/.ssh/id_rsa.pub'), 'read').read().strip()
+        ssh_key = open(os.path.expanduser('~/.ssh/id_rsa.pub'), 'r').read().strip()
         authorized_keys = host.file('/home/ansible/.ssh/authorized_keys')
 
         assert authorized_keys.is_file
@@ -28,6 +28,6 @@ def test_root_authorized_keys(host):
 
     with host.sudo():
 
-        ssh_key = open(os.path.expanduser('~/.ssh/id_rsa.pub'), 'read').read().strip()
+        ssh_key = open(os.path.expanduser('~/.ssh/id_rsa.pub'), 'r').read().strip()
 
         assert ssh_key not in host.file('/root/.ssh/authorized_keys').content_string