1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/rest/admin/__init__.py b/synapse/rest/admin/__init__.py
index fb73886df0..79f22a59f1 100644
--- a/synapse/rest/admin/__init__.py
+++ b/synapse/rest/admin/__init__.py
@@ -152,7 +152,7 @@ class PurgeHistoryRestServlet(RestServlet):
             logger.info("[purge] purging up to token %s (event_id %s)", token, event_id)
         elif "purge_up_to_ts" in body:
             ts = body["purge_up_to_ts"]
-            if not isinstance(ts, int):
+            if type(ts) is not int:
                 raise SynapseError(
                     HTTPStatus.BAD_REQUEST,
                     "purge_up_to_ts must be an int",