diff --git a/tests/testlib/sigpipe-remote.py b/tests/testlib/sigpipe-remote.py
--- a/tests/testlib/sigpipe-remote.py
+++ b/tests/testlib/sigpipe-remote.py
@@ -10,7 +10,10 @@ import time
 # we cannot use mercurial.testing as long as python2 is not dropped as the test
 # will only install the mercurial module for python2 in python2 run
 if sys.version_info[0] < 3:
+    ver = '.'.join(str(x) for x in sys.version_info)
+    exe = sys.executable
     print('SIGPIPE-HELPER: script should run with Python 3', file=sys.stderr)
+    print('SIGPIPE-HELPER:   %s is running %s' % (exe, ver), file=sys.stderr)
     sys.exit(255)
 
 if isinstance(sys.stdout.buffer, io.BufferedWriter):