diff --git a/poezio_omemo/__init__.py b/poezio_omemo/__init__.py
index af6dc93..c5f7092 100644
--- a/poezio_omemo/__init__.py
+++ b/poezio_omemo/__init__.py
@@ -150,7 +150,7 @@ class Plugin(E2EEPlugin):
             colored_fp += f'\x19{fg_color}}}{part}{separator}'
         return colored_fp
 
-    async def decrypt(self, message: Message, jid: Optional[JID], tab: ChatTab) -> None:
+    async def decrypt(self, message: Message, jid: Optional[JID], tab: Optional[ChatTab]) -> None:
         if jid is None:
             self.display_error('Unable to decrypt the message.')
             return None