diff --git a/django/core/db/backends/mysql.py b/django/core/db/backends/mysql.py
index e3e3a5a299..cfea2f640e 100644
--- a/django/core/db/backends/mysql.py
+++ b/django/core/db/backends/mysql.py
@@ -98,7 +98,7 @@ OPERATOR_MAPPING = {
 # be interpolated against the values of Field.__dict__ before being output.
 # If a column type is set to None, it won't be included in the output.
 DATA_TYPES = {
-    'AutoField':         'mediumint(9) auto_increment',
+    'AutoField':         'mediumint(9) unsigned auto_increment',
     'BooleanField':      'bool',
     'CharField':         'varchar(%(maxlength)s)',
     'CommaSeparatedIntegerField': 'varchar(%(maxlength)s)',