diff --git a/lemur/plugins/bases/destination.py b/lemur/plugins/bases/destination.py
index 486a656d..53c63e86 100644
--- a/lemur/plugins/bases/destination.py
+++ b/lemur/plugins/bases/destination.py
@@ -29,7 +29,7 @@ class ExportDestinationPlugin(DestinationPlugin):
 
     @property
     def options(self):
-        return list(self.default_options) + self.additional_options
+        return self.default_options + self.additional_options
 
     def export(self, body, private_key, cert_chain, options):
         export_plugin = self.get_option('exportPlugin', options)
diff --git a/lemur/plugins/bases/notification.py b/lemur/plugins/bases/notification.py
index 08e90e6f..054bdff5 100644
--- a/lemur/plugins/bases/notification.py
+++ b/lemur/plugins/bases/notification.py
@@ -46,7 +46,7 @@ class ExpirationNotificationPlugin(NotificationPlugin):
 
     @property
     def options(self):
-        return list(self.default_options) + self.additional_options
+        return self.default_options + self.additional_options
 
     def send(self, notification_type, message, targets, options, **kwargs):
         raise NotImplementedError
diff --git a/lemur/plugins/bases/source.py b/lemur/plugins/bases/source.py
index e2283fe9..f7fe655b 100644
--- a/lemur/plugins/bases/source.py
+++ b/lemur/plugins/bases/source.py
@@ -33,4 +33,4 @@ class SourcePlugin(Plugin):
 
     @property
     def options(self):
-        return list(self.default_options) + self.additional_options
+        return self.default_options + self.additional_options
diff --git a/lemur/plugins/lemur_digicert/plugin.py b/lemur/plugins/lemur_digicert/plugin.py
index 07ff9f4d..fe9f2198 100644
--- a/lemur/plugins/lemur_digicert/plugin.py
+++ b/lemur/plugins/lemur_digicert/plugin.py
@@ -349,6 +349,8 @@ class DigiCertCISSourcePlugin(SourcePlugin):
     author = 'Kevin Glisson'
     author_url = 'https://github.com/netflix/lemur.git'
 
+    additional_options = []
+
     def __init__(self, *args, **kwargs):
         """Initialize source with appropriate details."""
         required_vars = [