diff --git a/django/contrib/localflavor/es/forms.py b/django/contrib/localflavor/es/forms.py
index 522f5f4696..145bf90768 100644
--- a/django/contrib/localflavor/es/forms.py
+++ b/django/contrib/localflavor/es/forms.py
@@ -108,7 +108,7 @@ class ESIdentityCardNumberField(RegexField):
             if not letter2:
                 number, letter2 = number[:-1], int(number[-1])
             checksum = cif_get_checksum(number)
-            if letter2 in [checksum, self.cif_control[checksum]]:
+            if letter2 in (checksum, self.cif_control[checksum]):
                 return value
             else:
                 raise ValidationError, self.error_messages['invalid_cif']
@@ -180,5 +180,5 @@ class ESProvinceSelect(Select):
 def cif_get_checksum(number):
     s1 = sum([int(digit) for pos, digit in enumerate(number) if int(pos) % 2])
     s2 = sum([sum([int(unit) for unit in str(int(digit) * 2)]) for pos, digit in enumerate(number) if not int(pos) % 2])
-    return 10 - ((s1 + s2) % 10)
+    return (10 - ((s1 + s2) % 10)) % 10
 
diff --git a/tests/regressiontests/forms/localflavor/es.py b/tests/regressiontests/forms/localflavor/es.py
index f149aa9cbe..66d18dd0fc 100644
--- a/tests/regressiontests/forms/localflavor/es.py
+++ b/tests/regressiontests/forms/localflavor/es.py
@@ -167,6 +167,8 @@ Traceback (most recent call last):
 ValidationError: [u'Invalid checksum for NIE.']
 >>> f.clean('B38790911')
 'B38790911'
+>>> f.clean('B31234560')
+'B31234560'
 >>> f.clean('B-3879091A')
 'B3879091A'
 >>> f.clean('B 38790917')