diff --git a/src/tmp/wokkel/rsm.py b/src/tmp/wokkel/rsm.py
index 146f7ac7..9e5e626d 100644
--- a/src/tmp/wokkel/rsm.py
+++ b/src/tmp/wokkel/rsm.py
@@ -316,7 +316,7 @@ class PubSubClient(pubsub.PubSubClient):
         request = PubSubRequest('items')  # that's a rsm.PubSubRequest instance
         request.recipient = service
         request.nodeIdentifier = nodeIdentifier
-        if maxItems:
+        if maxItems is not None:
             request.maxItems = str(int(maxItems))
         request.subscriptionIdentifier = subscriptionIdentifier
         request.sender = sender