diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 6658d78..74dbfd2 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -509,11 +509,11 @@
         # Issue #1174606: reading from an unbounded stream such as /dev/zero.
         zero = "/dev/zero"
         if not os.path.exists(zero):
-            raise unittest.SkipTest("{0} does not exist".format(zero))
+            self.skip("{0} does not exist".format(zero))
         if sys.maxsize > 0x7FFFFFFF:
-            raise unittest.SkipTest("test can only run in a 32-bit address space")
+            self.skip("test can only run in a 32-bit address space")
         if support.real_max_memuse < support._2G:
-            raise unittest.SkipTest("test requires at least 2GB of memory")
+            self.skip("test requires at least 2GB of memory")
         with open(zero, "rb", buffering=0) as f:
             self.assertRaises(OverflowError, f.read)
         with open(zero, "rb") as f: