diff --git a/stratis_cli_cert.py b/stratis_cli_cert.py
index 5f29940..d80acd9 100644
--- a/stratis_cli_cert.py
+++ b/stratis_cli_cert.py
@@ -168,7 +168,7 @@ def test_access_stratis_man_page(self):
 
 
 class StratisCliCertify(
-    StratisdSystemdStart, StratisCertify
+    StratisdSystemdStart, StratisCertify, DbusMonitor
 ):  # pylint: disable=too-many-public-methods
     """
     Unit tests for the stratis-cli package.
diff --git a/stratisd_cert.py b/stratisd_cert.py
index a0ff331..2fed09a 100644
--- a/stratisd_cert.py
+++ b/stratisd_cert.py
@@ -164,7 +164,7 @@ def _unittest_command(self, result, expected_return_code):
 
 
 class StratisdCertify(
-    StratisdSystemdStart, StratisCertify
+    StratisdSystemdStart, StratisCertify, DbusMonitor
 ):  # pylint: disable=too-many-public-methods
     """
     Tests on stratisd, the principal daemon.