diff --git a/roles/backup_server/molecule/default/tests/test_parameters_mandatory.py b/roles/backup_server/molecule/default/tests/test_parameters_mandatory.py
index 2d551f19a6f9b968d0a29e0fc39b7a4d3e1bb82f..13ef853dd75c5eb555b74ad990bd251a9f5662ae 100644
--- a/roles/backup_server/molecule/default/tests/test_parameters_mandatory.py
+++ b/roles/backup_server/molecule/default/tests/test_parameters_mandatory.py
@@ -20,4 +20,4 @@ def test_firewall_configuration(host):
         assert firewall_config.user == 'root'
         assert firewall_config.group == 'root'
         assert firewall_config.mode == 0o640
-        assert firewall_config.content == "\n"
+        assert firewall_config.content_string == "\n"