diff --git a/lisa/target.py b/lisa/target.py
index b237b8f53ecd5ce3a5caf115c3c7f4e1bb8db737..6a6250f4eca67c3254c49c93a7cbbe559f6ccf81 100644
--- a/lisa/target.py
+++ b/lisa/target.py
@@ -618,7 +618,7 @@ class Target(
         List our attributes plus the ones from the underlying target, and the
         devlib modules that could be loaded on-demand.
         """
-        attrs = set(super().__dir__()) | self._devlib_loadable_modules
+        attrs = set(super().__dir__()) | set(self._devlib_loadable_modules)
         return sorted(attrs)
 
     @classmethod
diff --git a/lisa/tests/base.py b/lisa/tests/base.py
index e789608d17f7c8062c0febeb07f753523c61b602..908631af1cdcd3fa480dc1870bd4379b700beaba 100644
--- a/lisa/tests/base.py
+++ b/lisa/tests/base.py
@@ -629,7 +629,7 @@ class TestBundleMeta(abc.ABCMeta):
     # us as a metaclass:
     # https://docs.python.org/3/library/inspect.html#inspect.getmembers
     def __dir__(metacls):
-        return super().__dir__() + ['add_undecided_filter']
+        return sorted(super().__dir__()) + ['add_undecided_filter']
 
     @classmethod
     def __prepare__(metacls, cls_name, bases, **kwargs):
diff --git a/lisa/utils.py b/lisa/utils.py
index 471d506cc3e9f8a2b444731028ef722557882302..3a83b61ca63e9a962b8431a6eabe0f758339fb08 100644
--- a/lisa/utils.py
+++ b/lisa/utils.py
@@ -4592,7 +4592,7 @@ def DelegateToAttr(attr, attr_classes=None):
 
         def __dir__(self):
             delegated = getattr(self, delegated_to)
-            return sorted(set(super().__dir__()) | dir(delegated))
+            return sorted(set(super().__dir__()) | set(dir(delegated)))
 
     return _DelegatedToAttr