diff --git a/polls/models.py b/polls/models.py
index 63e2c0d..101fb9b 100644
--- a/polls/models.py
+++ b/polls/models.py
@@ -14,6 +14,7 @@ import datetime
 from django.db import models
 from django.utils import timezone
 from django.contrib import admin
+from django.core.validators import MaxValueValidator, MinValueValidator
 
 
 class Question(models.Model):
@@ -90,7 +91,7 @@ class Choice(models.Model):
 
     question = models.ForeignKey(Question, on_delete=models.CASCADE)
     choice_text = models.CharField(max_length=200)
-    votes = models.IntegerField(default=0)
+    votes = models.PositiveIntegerField(default=0, validators=[MinValueValidator(0), MaxValueValidator(2147483647)])
 
     def __str__(self):
         """