diff --git a/modules/account/tax.py b/modules/account/tax.py
index 15a162c2a2..716699776c 100644
--- a/modules/account/tax.py
+++ b/modules/account/tax.py
@@ -1253,6 +1253,7 @@ class TaxableMixin(object):
 
         return _TaxKey(**line)
 
+    @fields.depends('currency')
     def _round_taxes(self, taxes):
         if not self.currency:
             return