diff --git a/addons/account/i18n/account.pot b/addons/account/i18n/account.pot
index 59b3ffd98e9..36359a44ba3 100644
--- a/addons/account/i18n/account.pot
+++ b/addons/account/i18n/account.pot
@@ -631,7 +631,7 @@ msgstr ""
 
 #. module: account
 #: sql_constraint:account.fiscal.position.tax:0
-msgid "A tax fiscal position could be defined only once time on same taxes."
+msgid "A tax fiscal position could be defined only one time on same taxes."
 msgstr ""
 
 #. module: account
diff --git a/addons/account/models/partner.py b/addons/account/models/partner.py
index 34f51fc0204..f2485b379e6 100644
--- a/addons/account/models/partner.py
+++ b/addons/account/models/partner.py
@@ -175,7 +175,7 @@ class AccountFiscalPositionTax(models.Model):
     _sql_constraints = [
         ('tax_src_dest_uniq',
          'unique (position_id,tax_src_id,tax_dest_id)',
-         'A tax fiscal position could be defined only once time on same taxes.')
+         'A tax fiscal position could be defined only one time on same taxes.')
     ]
 
 
@@ -194,7 +194,7 @@ class AccountFiscalPositionAccount(models.Model):
     _sql_constraints = [
         ('account_src_dest_uniq',
          'unique (position_id,account_src_id,account_dest_id)',
-         'An account fiscal position could be defined only once time on same accounts.')
+         'An account fiscal position could be defined only one time on same accounts.')
     ]