diff --git a/master/buildbot/util/deferwaiter.py b/master/buildbot/util/deferwaiter.py
index <HASH>..<HASH> 100644
--- a/master/buildbot/util/deferwaiter.py
+++ b/master/buildbot/util/deferwaiter.py
@@ -37,6 +37,7 @@ class DeferWaiter:
 
         self._waited.add(id(d))
         d.addBoth(self._finished, d)
+        return d
 
     @defer.inlineCallbacks
     def wait(self):
util: Return added Deferred from DeferWaiter.add()