diff --git a/src/_zkapauthorizer/_plugin.py b/src/_zkapauthorizer/_plugin.py
index 0d38e95133d11d13ed913275d66aa7d61ba5da30..ddcf4d2263cade1e6722fc59840da0cbfda71651 100644
--- a/src/_zkapauthorizer/_plugin.py
+++ b/src/_zkapauthorizer/_plugin.py
@@ -17,6 +17,8 @@ The Twisted plugin that glues the Zero-Knowledge Access Pass system into
 Tahoe-LAFS.
 """
 
+from __future__ import absolute_import
+
 import random
 from datetime import datetime
 from functools import partial