1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/handlers/_base.py b/synapse/handlers/_base.py
index 935adea1ac..57429ad2ef 100644
--- a/synapse/handlers/_base.py
+++ b/synapse/handlers/_base.py
@@ -39,7 +39,7 @@ class BaseHandler(object):
         )
         if not allowed:
             raise LimitExceededError(
-                retry_after_ms=1000*(time_allowed - time_now),
+                retry_after_ms=int(1000*(time_allowed - time_now)),
             )