diff --git a/django/db/backends/oracle/creation.py b/django/db/backends/oracle/creation.py
index 219686789fc..2652aecfc76 100644
--- a/django/db/backends/oracle/creation.py
+++ b/django/db/backends/oracle/creation.py
@@ -23,7 +23,7 @@ DATA_TYPES = {
     'ImageField':                   'NVARCHAR2(%(max_length)s)',
     'IntegerField':                 'NUMBER(11)',
     'IPAddressField':               'VARCHAR2(15)',
-    'NullBooleanField':             'NUMBER(1) CHECK ((%(qn_column)s IN (0,1)) OR (%(column)s IS NULL))',
+    'NullBooleanField':             'NUMBER(1) CHECK ((%(qn_column)s IN (0,1)) OR (%(qn_column)s IS NULL))',
     'OneToOneField':                'NUMBER(11)',
     'PhoneNumberField':             'VARCHAR2(20)',
     'PositiveIntegerField':         'NUMBER(11) CHECK (%(qn_column)s >= 0)',