diff --git a/.github/scripts/run_with_env_secrets.py b/.github/scripts/run_with_env_secrets.py
index 15afd38221..0a5a1c7868 100644
--- a/.github/scripts/run_with_env_secrets.py
+++ b/.github/scripts/run_with_env_secrets.py
@@ -15,6 +15,7 @@ def run_cmd_or_die(cmd):
         stderr=subprocess.STDOUT,
         bufsize=1,
         universal_newlines=True,
+        errors="backslashreplace",
     )
     p.stdin.write("set -e\n")
     p.stdin.write(cmd)