diff --git a/purchase.py b/purchase.py
index c54ac1b624..6fbd8ccf5d 100644
--- a/purchase.py
+++ b/purchase.py
@@ -15,5 +15,5 @@ class Line(metaclass=PoolMeta):
         states={
             'invisible': Eval('type') != 'line',
             },
-        depends=['type', 'purchase'],
+        depends={'purchase'},
         help="Add to the cost of the work effort.")
diff --git a/work.py b/work.py
index 0fe194fa9d..ea798851d6 100644
--- a/work.py
+++ b/work.py
@@ -24,7 +24,7 @@ class Work(metaclass=PoolMeta):
         context={
             'company': Eval('company', -1),
             },
-        depends=['company'])
+        depends={'company'})
     list_price = Monetary(
         "List Price", currency='currency', digits=price_digits)
     revenue = fields.Function(Monetary(
@@ -52,8 +52,7 @@ class Work(metaclass=PoolMeta):
                 'Purchase Lines', domain=[
                     ('purchase.company', '=', Eval('company', -1)),
                     ('type', '=', 'line'),
-                    ],
-                depends=['company'])
+                    ])
 
     @classmethod
     def _get_cost(cls, works):