diff --git a/changelog.d/6945.bugfix b/changelog.d/6945.bugfix
new file mode 100644
index 000000000..8561be16a
--- /dev/null
+++ b/changelog.d/6945.bugfix
@@ -0,0 +1 @@
+Fix errors from logging in the purge jobs related to the message retention policies support.
diff --git a/synapse/handlers/pagination.py b/synapse/handlers/pagination.py
index caf841a64..9bf6d3966 100644
--- a/synapse/handlers/pagination.py
+++ b/synapse/handlers/pagination.py
@@ -133,7 +133,7 @@ class PaginationHandler(object):
             include_null = False
 
         logger.info(
-            "[purge] Running purge job for %d < max_lifetime <= %d (include NULLs = %s)",
+            "[purge] Running purge job for %s < max_lifetime <= %s (include NULLs = %s)",
             min_ms,
             max_ms,
             include_null,