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-rw-r--r--synapse/app/_base.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/app/_base.py b/synapse/app/_base.py
index 5fc59c1be1..152d1e5367 100644
--- a/synapse/app/_base.py
+++ b/synapse/app/_base.py
@@ -183,7 +183,7 @@ def quit_with_error(error_string: str) -> NoReturn:
     line_length = min(max(len(line) for line in message_lines), 80) + 2
     sys.stderr.write("*" * line_length + "\n")
     for line in message_lines:
-        sys.stderr.write(" %s\n" % (line.rstrip(),))
+        sys.stderr.write(f" {line.rstrip()}\n")
     sys.stderr.write("*" * line_length + "\n")
     sys.exit(1)