diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index 6fe4eda..2d485b3 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -1188,19 +1188,6 @@
         test_zipfile
         test_zlib
         """,
-    'atheos':
-        """
-        test_curses
-        test_dbm_gnu
-        test_epoll
-        test_largefile
-        test_locale
-        test_kqueue
-        test_mhlib
-        test_mmap
-        test_poll
-        test_resource
-        """,
     'cygwin':
         """
         test_curses
diff --git a/Lib/test/test_fcntl.py b/Lib/test/test_fcntl.py
index 3c18f1d..e8eeaaa 100755
--- a/Lib/test/test_fcntl.py
+++ b/Lib/test/test_fcntl.py
@@ -16,15 +16,12 @@
 # TODO - Write tests for flock() and lockf().
 
 def get_lockdata():
-    if sys.platform.startswith('atheos'):
-        start_len = "qq"
+    try:
+        os.O_LARGEFILE
+    except AttributeError:
+        start_len = "ll"
     else:
-        try:
-            os.O_LARGEFILE
-        except AttributeError:
-            start_len = "ll"
-        else:
-            start_len = "qq"
+        start_len = "qq"
 
     if sys.platform in ('netbsd1', 'netbsd2', 'netbsd3',
                         'Darwin1.2', 'darwin',
diff --git a/Lib/test/test_file.py b/Lib/test/test_file.py
index bd2d7c0..fa867e0 100644
--- a/Lib/test/test_file.py
+++ b/Lib/test/test_file.py
@@ -106,8 +106,7 @@
                    ('writelines', ([],)),
                    ('__iter__', ()),
                    ]
-        if not sys.platform.startswith('atheos'):
-            methods.append(('truncate', ()))
+        methods.append(('truncate', ()))
 
         # __exit__ should close the file
         self.f.__exit__(None, None, None)
diff --git a/Lib/test/test_fileio.py b/Lib/test/test_fileio.py
index 679ed08..4ce3746 100644
--- a/Lib/test/test_fileio.py
+++ b/Lib/test/test_fileio.py
@@ -96,8 +96,6 @@
         methods = ['fileno', 'isatty', 'read', 'readinto',
                    'seek', 'tell', 'truncate', 'write', 'seekable',
                    'readable', 'writable']
-        if sys.platform.startswith('atheos'):
-            methods.remove('truncate')
 
         self.f.close()
         self.assertTrue(self.f.closed)