diff --git a/Src/IronPython/Lib/iptest/test_env.py b/Src/IronPython/Lib/iptest/test_env.py
index 94006df20..bf898ccbc 100644
--- a/Src/IronPython/Lib/iptest/test_env.py
+++ b/Src/IronPython/Lib/iptest/test_env.py
@@ -21,6 +21,7 @@
 is_netcoreapp31 = False
 is_net60 = False
 is_net70 = False
+is_net80 = False
 is_mono = False
 is_netstandard = False
 if is_ironpython:
@@ -30,6 +31,7 @@
     is_netcoreapp31 = clr.FrameworkDescription.startswith(".NET Core 3.1")
     is_net60 = clr.FrameworkDescription.startswith(".NET 6.0")
     is_net70 = clr.FrameworkDescription.startswith(".NET 7.0")
+    is_net80 = clr.FrameworkDescription.startswith(".NET 8.0")
     is_mono = clr.IsMono
     is_netstandard = clr.TargetFramework.startswith(".NETStandard")
 
diff --git a/Tests/test_cliclass.py b/Tests/test_cliclass.py
index ee037177f..506fd47c5 100644
--- a/Tests/test_cliclass.py
+++ b/Tests/test_cliclass.py
@@ -4,7 +4,7 @@
 
 import sys
 import unittest
-from iptest import IronPythonTestCase, is_cli, is_debug, is_mono, is_net70, is_netcoreapp, is_netcoreapp21, is_posix, big, run_test, skipUnlessIronPython
+from iptest import IronPythonTestCase, is_cli, is_debug, is_mono, is_net70, is_net80, is_netcoreapp, is_netcoreapp21, is_posix, big, run_test, skipUnlessIronPython
 
 if is_cli:
     import clr
@@ -1421,7 +1421,7 @@ def test_clr_dir(self):
         self.assertTrue('IndexOf' not in clr.Dir('abc'))
         self.assertTrue('IndexOf' in clr.DirClr('abc'))
 
-    @unittest.skipIf(is_net70, "TODO") # TODO: https://github.com/IronLanguages/ironpython3/issues/1485
+    @unittest.skipIf(is_net70 or is_net80, "TODO") # TODO: https://github.com/IronLanguages/ironpython3/issues/1485
     def test_int32_bigint_equivalence(self):
         import math
 
diff --git a/Tests/test_int.py b/Tests/test_int.py
index 34ab61d16..e2c60e145 100644
--- a/Tests/test_int.py
+++ b/Tests/test_int.py
@@ -4,7 +4,7 @@
 
 import sys
 
-from iptest import IronPythonTestCase, is_cli, is_net70, is_netstandard, is_mono, big, myint, skipUnlessIronPython, run_test
+from iptest import IronPythonTestCase, is_cli, is_net70, is_net80, is_netstandard, is_mono, big, myint, skipUnlessIronPython, run_test
 
 class IntNoClrTest(IronPythonTestCase):
     """Must be run before IntTest because it depends on CLR API not being visible."""
@@ -27,7 +27,7 @@ def test_instance_set(self):
             self.assertSetEqual(set(dir(j)) - set(dir(i)), {'GetByteCount', 'TryWriteBytes'})
             self.assertSetEqual(set(dir(int)) - set(dir(Int32)), {'GetByteCount', 'TryWriteBytes'})
 
-        if is_net70: # https://github.com/IronLanguages/ironpython3/issues/1485
+        if is_net70 or is_net80: # https://github.com/IronLanguages/ironpython3/issues/1485
             diff = {'TryConvertToChecked', 'MinValue', 'TryConvertFromChecked', 'MaxValue', 'TryConvertFromTruncating', 'WriteBigEndian', 'GetShortestBitLength', 'TryWriteLittleEndian', 'WriteLittleEndian', 'TryConvertToSaturating', 'TryConvertFromSaturating', 'TryWriteBigEndian', 'TryConvertToTruncating'}
             self.assertSetEqual(set(dir(i)) - set(dir(j)), diff)
             self.assertSetEqual(set(dir(Int32)) - set(dir(int)), diff)
diff --git a/Tests/test_methodbinder1.py b/Tests/test_methodbinder1.py
index d5b2e41a6..b670dc856 100644
--- a/Tests/test_methodbinder1.py
+++ b/Tests/test_methodbinder1.py
@@ -8,7 +8,7 @@
 
 import unittest
 
-from iptest import IronPythonTestCase, is_mono, is_net70, is_netcoreapp, run_test, skipUnlessIronPython
+from iptest import IronPythonTestCase, is_mono, is_net70, is_net80, is_netcoreapp, run_test, skipUnlessIronPython
 from iptest.type_util import *
 
 from System import Int32
@@ -176,7 +176,7 @@ def test_this_matrix(self):
 
 
 
-        ch2bi = True if is_net70 else TypeE # .NET 7 adds an implicit cast from Char to BigInteger
+        ch2bi = True if is_net70 or is_net80 else TypeE # .NET 7 adds an implicit cast from Char to BigInteger
         ##################################################  pass in char    #########################################################
         ####                                     M201   M680   M202   M203   M681   M204   M205   M301   M302   M303   M304   M310   M311   M312   M313   M320   M321   M400
         ####                                     int    int?   double bigint bigint? bool  str    sbyte  i16    i64    single byte   ui16   ui32   ui64   char   decm   obj