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-rw-r--r--Lib/test/libregrtest/runtest_mp.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/test/libregrtest/runtest_mp.py b/Lib/test/libregrtest/runtest_mp.py
index 9604c16600..74ac4fa895 100644
--- a/Lib/test/libregrtest/runtest_mp.py
+++ b/Lib/test/libregrtest/runtest_mp.py
@@ -41,7 +41,7 @@ def run_test_in_subprocess(testname, ns):
slaveargs = json.dumps(slaveargs)
cmd = [sys.executable, *support.args_from_interpreter_flags(),
- '-X', 'faulthandler',
+ '-u', # Unbuffered stdout and stderr
'-m', 'test.regrtest',
'--slaveargs', slaveargs]
if ns.pgo: