diff --git a/roles/bootstrap/molecule/default/tests/test_parameters_optional.py b/roles/bootstrap/molecule/default/tests/test_parameters_optional.py
index 041d5e687f2393cde4418cf637c5d3b251664952..7b4f3e5be3a8bc8edee100eea3f20ecca30f534e 100644
--- a/roles/bootstrap/molecule/default/tests/test_parameters_optional.py
+++ b/roles/bootstrap/molecule/default/tests/test_parameters_optional.py
@@ -14,7 +14,7 @@ def test_authorized_keys(host):
 
     with host.sudo():
 
-        ssh_key = open('tests/data/ansible_key.pub', 'read').read().strip()
+        ssh_key = open('tests/data/ansible_key.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_authorised_keys(host):
 
     with host.sudo():
 
-        ssh_key = open('tests/data/ansible_key.pub', 'read').read().strip()
+        ssh_key = open('tests/data/ansible_key.pub', 'r').read().strip()
 
         assert ssh_key not in host.file('/root/.ssh/authorized_keys').content_string