diff --git a/pillar/api/utils/authentication.py b/pillar/api/utils/authentication.py
index 3940b621..8f153eb2 100644
--- a/pillar/api/utils/authentication.py
+++ b/pillar/api/utils/authentication.py
@@ -189,7 +189,7 @@ def validate_this_token(token, oauth_subclient=None):
         return None
 
     g.current_user = UserClass.construct(token, db_user)
-    user_authenticated.send(None)
+    user_authenticated.send(sender=g.current_user)
 
     return db_user
 
diff --git a/pillar/auth/__init__.py b/pillar/auth/__init__.py
index 14ee63ff..9f13b690 100644
--- a/pillar/auth/__init__.py
+++ b/pillar/auth/__init__.py
@@ -12,7 +12,9 @@ from werkzeug.local import LocalProxy
 
 from pillar import current_app
 
+# The sender is the user that was just authenticated.
 user_authenticated = blinker.Signal('Sent whenever a user was authenticated')
+
 log = logging.getLogger(__name__)
 
 # Mapping from user role to capabilities obtained by users with that role.
@@ -225,7 +227,7 @@ def login_user_object(user: UserClass):
     """Log in the given user."""
     flask_login.login_user(user, remember=True)
     g.current_user = user
-    user_authenticated.send(None)
+    user_authenticated.send(sender=user)
 
 
 def logout_user():