diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index b64a044b7db..782d9f10859 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -128,7 +128,7 @@ class ProcessTestCase(BaseTestCase):
                      "import sys; sys.stdout.write('BDFL')\n"
                      "sys.stdout.flush()\n"
                      "while True: pass"],
-                    timeout=0.5)
+                    timeout=1.5)
             self.fail("Expected TimeoutExpired.")
         self.assertEqual(c.exception.output, b'BDFL')