diff --git a/synapse/logging/_terse_json.py b/synapse/logging/_terse_json.py
index d9ff70b252..5afa4c5fa9 100644
--- a/synapse/logging/_terse_json.py
+++ b/synapse/logging/_terse_json.py
@@ -89,7 +89,7 @@ class TerseJsonFormatter(JsonFormatter):
             "log": record.getMessage(),
             "namespace": record.name,
             "level": record.levelname,
-            "time": round(record.created, 2),
+            "time": record.created,
         }
 
         return self._format(record, event)