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-rw-r--r--src/mailman/archiving/mhonarc.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mailman/archiving/mhonarc.py b/src/mailman/archiving/mhonarc.py
index 1f9102f19..47113108b 100644
--- a/src/mailman/archiving/mhonarc.py
+++ b/src/mailman/archiving/mhonarc.py
@@ -81,7 +81,7 @@ class MHonArc:
command = expand(self.command, substitutions)
proc = subprocess.Popen(
command, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
- shell=True)
+ universal_newlines=True, shell=True)
stdout, stderr = proc.communicate(msg.as_string())
if proc.returncode != 0:
log.error('%s: mhonarc subprocess had non-zero exit code: %s' %