diff --git a/src/partisan/irods.py b/src/partisan/irods.py
index 2249d8a..b3bfa36 100644
--- a/src/partisan/irods.py
+++ b/src/partisan/irods.py
@@ -1687,7 +1687,7 @@ def acl(self, timeout=None, tries=1) -> List[AC]:
                 if own and read:
                     acs.difference_update(read)
 
-            acl.append(*acs)
+            acl.extend(acs)
 
         return sorted(acl)