diff --git a/trytond/trytond/ir/translation.py b/trytond/trytond/ir/translation.py
index 3a673f067f0..673d2b3f923 100644
--- a/trytond/trytond/ir/translation.py
+++ b/trytond/trytond/ir/translation.py
@@ -695,9 +695,10 @@ def extra_model_data(cls, model_data):
     @property
     def unique_key(self):
         if self.type in {
-                'report', 'view', 'wizard_button', 'selection'}:
+                'report', 'view', 'wizard_button', 'selection',
+                'field', 'help'}:
             return (self.name, self.res_id, self.type, self.src)
-        elif self.type in ('field', 'model', 'help'):
+        elif self.type == 'model':
             return (self.name, self.res_id, self.type)
 
     @classmethod