diff --git a/roles/bootstrap/molecule/default/tests/test_parameters_optional.py b/roles/bootstrap/molecule/default/tests/test_parameters_optional.py
index d9792e7c684a7bef085bc8edd595a543b5aaa22b..041d5e687f2393cde4418cf637c5d3b251664952 100644
--- a/roles/bootstrap/molecule/default/tests/test_parameters_optional.py
+++ b/roles/bootstrap/molecule/default/tests/test_parameters_optional.py
@@ -18,7 +18,7 @@ def test_authorized_keys(host):
         authorized_keys = host.file('/home/ansible/.ssh/authorized_keys')
 
         assert authorized_keys.is_file
-        assert ssh_key in authorized_keys.content
+        assert ssh_key in authorized_keys.content_string
 
 
 def test_root_authorised_keys(host):
@@ -30,4 +30,4 @@ def test_root_authorised_keys(host):
 
         ssh_key = open('tests/data/ansible_key.pub', 'read').read().strip()
 
-        assert ssh_key not in host.file('/root/.ssh/authorized_keys').content
+        assert ssh_key not in host.file('/root/.ssh/authorized_keys').content_string