diff --git a/tests/defer_regress/models.py b/tests/defer_regress/models.py
index 55eac8c537..8b05fc4130 100644
--- a/tests/defer_regress/models.py
+++ b/tests/defer_regress/models.py
@@ -76,11 +76,11 @@ class ItemAndSimpleItem(models.Model):
 
 
 class Profile(models.Model):
-    profile1 = models.CharField(max_length=1000, default='profile1')
+    profile1 = models.CharField(max_length=255, default='profile1')
 
 
 class Location(models.Model):
-    location1 = models.CharField(max_length=1000, default='location1')
+    location1 = models.CharField(max_length=255, default='location1')
 
 
 class Request(models.Model):
@@ -88,10 +88,10 @@ class Request(models.Model):
     location = models.ForeignKey(Location, models.CASCADE)
     items = models.ManyToManyField(Item)
 
-    request1 = models.CharField(default='request1', max_length=1000)
-    request2 = models.CharField(default='request2', max_length=1000)
-    request3 = models.CharField(default='request3', max_length=1000)
-    request4 = models.CharField(default='request4', max_length=1000)
+    request1 = models.CharField(default='request1', max_length=255)
+    request2 = models.CharField(default='request2', max_length=255)
+    request3 = models.CharField(default='request3', max_length=255)
+    request4 = models.CharField(default='request4', max_length=255)
 
 
 class Base(models.Model):
diff --git a/tests/foreign_object/models/article.py b/tests/foreign_object/models/article.py
index 851029efa1..103661a4a3 100644
--- a/tests/foreign_object/models/article.py
+++ b/tests/foreign_object/models/article.py
@@ -83,7 +83,7 @@ class ArticleTranslation(models.Model):
     lang = models.CharField(max_length=2)
     title = models.CharField(max_length=100)
     body = models.TextField()
-    abstract = models.CharField(max_length=400, null=True)
+    abstract = models.TextField(null=True)
 
     class Meta:
         unique_together = ('article', 'lang')
diff --git a/tests/generic_views/models.py b/tests/generic_views/models.py
index 8f806b9a85..5733e44093 100644
--- a/tests/generic_views/models.py
+++ b/tests/generic_views/models.py
@@ -39,7 +39,7 @@ DoesNotExistBookManager = BaseManager.from_queryset(DoesNotExistQuerySet)
 
 
 class Book(models.Model):
-    name = models.CharField(max_length=300)
+    name = models.CharField(max_length=255)
     slug = models.SlugField()
     pages = models.IntegerField()
     authors = models.ManyToManyField(Author)
@@ -57,7 +57,7 @@ class Book(models.Model):
 
 class Page(models.Model):
     content = models.TextField()
-    template = models.CharField(max_length=300)
+    template = models.CharField(max_length=255)
 
 
 class BookSigning(models.Model):
diff --git a/tests/get_or_create/models.py b/tests/get_or_create/models.py
index cfde80ce85..865798ae98 100644
--- a/tests/get_or_create/models.py
+++ b/tests/get_or_create/models.py
@@ -29,7 +29,7 @@ class Tag(models.Model):
 
 
 class Thing(models.Model):
-    name = models.CharField(max_length=256)
+    name = models.CharField(max_length=255)
     tags = models.ManyToManyField(Tag)
 
 
diff --git a/tests/model_fields/models.py b/tests/model_fields/models.py
index f6e94a841e..2208a8d4b8 100644
--- a/tests/model_fields/models.py
+++ b/tests/model_fields/models.py
@@ -74,7 +74,7 @@ class WhizIterEmpty(models.Model):
 
 
 class BigD(models.Model):
-    d = models.DecimalField(max_digits=38, decimal_places=30)
+    d = models.DecimalField(max_digits=32, decimal_places=30)
 
 
 class FloatModel(models.Model):
diff --git a/tests/model_inheritance_regress/models.py b/tests/model_inheritance_regress/models.py
index 358217554b..5e4c928dc9 100644
--- a/tests/model_inheritance_regress/models.py
+++ b/tests/model_inheritance_regress/models.py
@@ -193,7 +193,7 @@ class MessyBachelorParty(BachelorParty):
 
 # Check concrete -> abstract -> concrete inheritance
 class SearchableLocation(models.Model):
-    keywords = models.CharField(max_length=256)
+    keywords = models.CharField(max_length=255)
 
 
 class Station(SearchableLocation):
diff --git a/tests/servers/models.py b/tests/servers/models.py
index 6e1414ae19..b523bae6f2 100644
--- a/tests/servers/models.py
+++ b/tests/servers/models.py
@@ -2,4 +2,4 @@ from django.db import models
 
 
 class Person(models.Model):
-    name = models.CharField(max_length=256)
+    name = models.CharField(max_length=255)