diff --git a/tutorial.py b/tutorial.py
index 8e2eb5e..7b2cb6c 100644
--- a/tutorial.py
+++ b/tutorial.py
@@ -108,11 +108,10 @@ class GalateaTutorial(ModelSQL, ModelView):
             'image_size': ('Thumb "%(file_name)s" size is larger than "%(size)s"Kb'),
             })
 
+    @fields.depends('name', 'slug')
     def on_change_name(self):
-        res = {}
         if self.name and not self.slug:
-            res['slug'] = slugify(self.name)
-        return res
+            self.slug = slugify(self.name)
 
     @classmethod
     def write(cls, *args):