X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/f4ca9ad94a6bb006d1f3c7ba207837f1736d1247..d89fc97f4a7ee74edcb1a5856fec560c748b9086:/sdk/python/tests/run_test_server.py

diff --git a/sdk/python/tests/run_test_server.py b/sdk/python/tests/run_test_server.py
index 155bcedc62..8f2d4406fe 100644
--- a/sdk/python/tests/run_test_server.py
+++ b/sdk/python/tests/run_test_server.py
@@ -192,7 +192,7 @@ def _fifo2stderr(label):
             raise
     os.mkfifo(fifo, 0700)
     subprocess.Popen(
-        ['sed', '-e', 's/^/['+label+'] /', fifo],
+        ['stdbuf', '-i0', '-oL', '-eL', 'sed', '-e', 's/^/['+label+'] /', fifo],
         stdout=sys.stderr)
     return fifo