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-rw-r--r--synapse/config/server.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/config/server.py b/synapse/config/server.py
index 8efab924d4..aa71835dc3 100644
--- a/synapse/config/server.py
+++ b/synapse/config/server.py
@@ -165,7 +165,7 @@ class ServerConfig(Config):
         # How long to keep redacted events in the database in unredacted form
         # before redacting them.
         redaction_retention_period = config.get("redaction_retention_period")
-        if redaction_retention_period:
+        if redaction_retention_period is not None:
             self.redaction_retention_period = self.parse_duration(
                 redaction_retention_period
             )