diff --git a/trlc/trlc.py b/trlc/trlc.py
index 4798b03..6c0db92 100644
--- a/trlc/trlc.py
+++ b/trlc/trlc.py
@@ -18,20 +18,19 @@
 # You should have received a copy of the GNU General Public License
 # along with TRLC. If not, see <https://www.gnu.org/licenses/>.
 
-import re
-import os
-import sys
-import json
 import argparse
+import json
+import os
+import re
 import subprocess
+import sys
 from fractions import Fraction
 
-from trlc import ast
-from trlc import lint
-from trlc.errors import TRLC_Error, Location, Message_Handler, Kind
-from trlc.parser import Parser
+from trlc import ast, lint
+from trlc.errors import Kind, Location, Message_Handler, TRLC_Error
 from trlc.lexer import Token_Stream
-from trlc.version import TRLC_VERSION, BUGS_URL
+from trlc.parser import Parser
+from trlc.version import BUGS_URL, TRLC_VERSION
 
 # pylint: disable=unused-import
 try:
@@ -551,7 +550,7 @@ def process(self):
         return self.stab
 
 
-def main():
+def trlc():
     ap = argparse.ArgumentParser(
         prog="trlc",
         description="TRLC %s (Python reference implementation)" % TRLC_VERSION,
@@ -821,5 +820,16 @@ def get_status(parser):
     return 1
 
 
+def main():
+    try:
+        return trlc()
+    except BrokenPipeError:
+        # Python flushes standard streams on exit; redirect remaining output
+        # to devnull to avoid another BrokenPipeError at shutdown
+        devnull = os.open(os.devnull, os.O_WRONLY)
+        os.dup2(devnull, sys.stdout.fileno())
+        return 141
+
+
 if __name__ == "__main__":
     sys.exit(main())