diff --git a/src/ldaptool/decode/_decoder.py b/src/ldaptool/decode/_decoder.py
index 28ef42c..793431a 100644
--- a/src/ldaptool/decode/_decoder.py
+++ b/src/ldaptool/decode/_decoder.py
@@ -101,7 +101,7 @@ class Attribute:
                 return
 
     def _try_decode(self, args: Arguments) -> None:
-        if self.name in ("objectSid",):
+        if self.name in ("objectSid","securityIdentifier"):
             self._try_decode_sid()
         elif self.name in ("msExchMailboxGuid", "objectGUID"):
             self._try_decode_uuid()