diff --git a/tempest/lib/services/compute/servers_client.py b/tempest/lib/services/compute/servers_client.py
index 24557d8..597e815 100644
--- a/tempest/lib/services/compute/servers_client.py
+++ b/tempest/lib/services/compute/servers_client.py
@@ -100,7 +100,7 @@
         any changes.
         :param disk_config: The name is changed to OS-DCF:diskConfig
         """
-        if kwargs.get('disk_config'):
+        if 'disk_config' in kwargs:
             kwargs['OS-DCF:diskConfig'] = kwargs.pop('disk_config')
 
         post_body = json.dumps({'server': kwargs})
diff --git a/tempest/lib/services/image/v1/images_client.py b/tempest/lib/services/image/v1/images_client.py
index e67a547..03f4c4b 100644
--- a/tempest/lib/services/image/v1/images_client.py
+++ b/tempest/lib/services/image/v1/images_client.py
@@ -115,7 +115,7 @@
         if detail:
             url += '/detail'
 
-        if kwargs.get('changes_since'):
+        if 'changes_since' in kwargs:
             kwargs['changes-since'] = kwargs.pop('changes_since')
 
         if len(kwargs) > 0: