1 files changed, 5 insertions, 4 deletions

diff --git a/src/pgpmailman/styles/discussion.py b/src/pgpmailman/styles/discussion.py
index 310b7a1..55304cd 100644
--- a/src/pgpmailman/styles/discussion.py
+++ b/src/pgpmailman/styles/discussion.py
@@ -1,10 +1,11 @@
-from mailman.interfaces.styles import IStyle
+""""""
+
+from mailman.styles.default import LegacyDefaultStyle
 from public import public
-from zope.interface import implementer
 
 
 @public
-@implementer(IStyle)
-class Discussion:
+class Discussion(LegacyDefaultStyle):
     def apply(self, mailing_list):
         """See `IStyle`."""
+        super().apply(mailing_list)