diff --git a/tests/get_or_create/models.py b/tests/get_or_create/models.py
index 4107e185a35..e5cfb139161 100644
--- a/tests/get_or_create/models.py
+++ b/tests/get_or_create/models.py
@@ -2,7 +2,7 @@
 
 
 class Person(models.Model):
-    first_name = models.CharField(max_length=100, unique=True)
+    first_name = models.CharField(max_length=100, primary_key=True)
     last_name = models.CharField(max_length=100)
     birthday = models.DateField()
     defaults = models.TextField()
@@ -22,7 +22,7 @@ class Profile(models.Model):
 
 
 class Tag(models.Model):
-    text = models.CharField(max_length=255, unique=True)
+    text = models.CharField(max_length=255, primary_key=True)
 
 
 class Thing(models.Model):