diff --git a/synapse/rest/client/v1/admin.py b/synapse/rest/client/v1/admin.py
index 8458195256..b8665a45eb 100644
--- a/synapse/rest/client/v1/admin.py
+++ b/synapse/rest/client/v1/admin.py
@@ -188,7 +188,7 @@ class PurgeHistoryRestServlet(ClientV1RestServlet):
             (stream, topo, _event_id) = r
             token = "t%d-%d" % (topo, stream)
             logger.info(
-                "[purge] purging up to token %d (received_ts %i => "
+                "[purge] purging up to token %s (received_ts %i => "
                 "stream_ordering %i)",
                 token, ts, stream_ordering,
             )