diff --git a/tests/utils.py b/tests/utils.py
index edb3e86c..f446145a 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -240,8 +240,7 @@ def emit(self, record):
         log_entry = self.format(record)
         log_level = record.levelname.lower().replace("warning", "warn")
         self.tx_log.emit(
-            twisted.logger.LogLevel.levelWithName(log_level),
-            log_entry.replace("{", r"(").replace("}", r")"),
+            twisted.logger.LogLevel.levelWithName(log_level), "{entry}", entry=log_entry
         )