diff --git a/tests/regressiontests/serializers_regress/models.py b/tests/regressiontests/serializers_regress/models.py
index f8bcb34d06..f9af1d26ca 100644
--- a/tests/regressiontests/serializers_regress/models.py
+++ b/tests/regressiontests/serializers_regress/models.py
@@ -176,8 +176,9 @@ class IntegerPKData(models.Model):
 class IPAddressPKData(models.Model):
     data = models.IPAddressField(primary_key=True)
 
-class NullBooleanPKData(models.Model):
-    data = models.NullBooleanField(primary_key=True)
+# This is just a Boolean field with null=True, and we can't test a PK value of NULL.
+# class NullBooleanPKData(models.Model):
+#     data = models.NullBooleanField(primary_key=True)
 
 class PhonePKData(models.Model):
     data = models.PhoneNumberField(primary_key=True)
diff --git a/tests/regressiontests/serializers_regress/tests.py b/tests/regressiontests/serializers_regress/tests.py
index 30fd20a80c..86dc311269 100644
--- a/tests/regressiontests/serializers_regress/tests.py
+++ b/tests/regressiontests/serializers_regress/tests.py
@@ -236,8 +236,8 @@ The end."""),
     (pk_obj, 682, IntegerPKData, 0),
 #     (XX, ImagePKData
     (pk_obj, 690, IPAddressPKData, "127.0.0.1"),
-    (pk_obj, 700, NullBooleanPKData, True),
-    (pk_obj, 701, NullBooleanPKData, False),
+    # (pk_obj, 700, NullBooleanPKData, True),
+    # (pk_obj, 701, NullBooleanPKData, False),
     (pk_obj, 710, PhonePKData, "212-634-5789"),
     (pk_obj, 720, PositiveIntegerPKData, 123456789),
     (pk_obj, 730, PositiveSmallIntegerPKData, 12),