diff --git a/flaschengeist/config.py b/flaschengeist/config.py
index 100d6e3..1ae840f 100644
--- a/flaschengeist/config.py
+++ b/flaschengeist/config.py
@@ -47,7 +47,7 @@ def configure_app(app):
     logging.config.dictConfig(logger_config)
 
     if "secret_key" not in config["FLASCHENGEIST"]:
-        logger.warn("No secret key was configured, please configure one for production systems!")
+        logger.warning("No secret key was configured, please configure one for production systems!")
         app.config["SECRET_KEY"] = "0a657b97ef546da90b2db91862ad4e29"
     else:
         app.config["SECRET_KEY"] = config["FLASCHENGEIST"]["secret_key"]
diff --git a/flaschengeist/models/user.py b/flaschengeist/models/user.py
index 57ea213..cd1bfce 100644
--- a/flaschengeist/models/user.py
+++ b/flaschengeist/models/user.py
@@ -1,6 +1,7 @@
 from datetime import date
 from typing import Optional
 
+from flask import url_for
 from sqlalchemy.orm.collections import attribute_mapped_collection
 
 from . import ModelSerializeMixin
@@ -54,9 +55,9 @@ class User(db.Model, ModelSerializeMixin):
     firstname: str = db.Column(db.String(50), nullable=False)
     lastname: str = db.Column(db.String(50), nullable=False)
     mail: str = db.Column(db.String(60), nullable=False)
-    avatar_url: Optional[str] = db.Column(db.String(60))
     birthday: Optional[date] = db.Column(db.Date)
     roles: [str] = []
+    avatar_url: Optional[str] = ""
 
     roles_: [Role] = db.relationship("Role", secondary=association_table, cascade="save-update, merge")
     _id = db.Column("id", db.Integer, primary_key=True)
@@ -65,6 +66,10 @@ class User(db.Model, ModelSerializeMixin):
         "_UserAttribute", collection_class=attribute_mapped_collection("name"), cascade="all, delete"
     )
 
+    @property
+    def avatar_url(self):
+        return url_for('users.get_avatar', userid=self.userid)
+
     @property
     def roles(self):
         return [role.name for role in self.roles_]