diff --git a/django/db/backends/oracle/creation.py b/django/db/backends/oracle/creation.py
index 0b322bbfc7..982689523e 100644
--- a/django/db/backends/oracle/creation.py
+++ b/django/db/backends/oracle/creation.py
@@ -22,8 +22,8 @@ DATA_TYPES = {
     'NullBooleanField':             'NUMBER(1) CHECK ((%(column)s IN (0,1)) OR (%(column)s IS NULL))',
     'OneToOneField':                'NUMBER(11)',
     'PhoneNumberField':             'VARCHAR2(20)',
-    'PositiveIntegerField':         'NUMBER(11) CHECK (%(column)s >= 1)',
-    'PositiveSmallIntegerField':    'NUMBER(11) CHECK (%(column)s >= 1)',
+    'PositiveIntegerField':         'NUMBER(11) CHECK (%(column)s >= 0)',
+    'PositiveSmallIntegerField':    'NUMBER(11) CHECK (%(column)s >= 0)',
     'SlugField':                    'VARCHAR2(50)',
     'SmallIntegerField':            'NUMBER(11)',
     'TextField':                    'NCLOB',