diff --git a/src/_zkapauthorizer/controller.py b/src/_zkapauthorizer/controller.py
index 9f5581bba655de2b6b6b4f6ba09736f90a47f8cb..3cb4c1d015e04697a2a078cbf3ab58df7893fb35 100644
--- a/src/_zkapauthorizer/controller.py
+++ b/src/_zkapauthorizer/controller.py
@@ -101,7 +101,7 @@ from .model import (
     Error as model_Error,
 )
 
-RETRY_INTERVAL = timedelta(seconds=0)
+RETRY_INTERVAL = timedelta(milliseconds=1)
 
 class AlreadySpent(Exception):
     """