diff --git a/lib/rapi/rlib2.py b/lib/rapi/rlib2.py
index a84ce325738931c43514d32b0445d43e9cd13cd7..d2e40514ff91223e7146ed11bf4000702033f756 100644
--- a/lib/rapi/rlib2.py
+++ b/lib/rapi/rlib2.py
@@ -459,6 +459,7 @@ class _R_Tags(baserlib.R_Generic):
   TAG_LEVEL for it.
 
   """
+  TAG_LEVEL = None
 
   def __init__(self, items, queryargs, req):
     """A tag resource constructor.