HPC observer, WIP
diff --git a/xos/hpc_observer/steps/sync_cdnprefix.py b/xos/hpc_observer/steps/sync_cdnprefix.py
index f62f63a..584e591 100644
--- a/xos/hpc_observer/steps/sync_cdnprefix.py
+++ b/xos/hpc_observer/steps/sync_cdnprefix.py
@@ -18,6 +18,7 @@
 
 class SyncCDNPrefix(SyncStep, HpcLibrary):
     provides=[CDNPrefix]
+    observes=CDNPrefix
     requested_interval=0
 
     def __init__(self, **args):