diff --git a/lib/avalon/workflow/workflow_datastream.rb b/lib/avalon/workflow/workflow_datastream.rb
index d1e0457..215411c 100644
--- a/lib/avalon/workflow/workflow_datastream.rb
+++ b/lib/avalon/workflow/workflow_datastream.rb
@@ -140,6 +140,10 @@ def self.xml_template
     builder.doc
   end
 
+  def prefix
+    ""
+  end
+
   def to_solr(solr_doc=SolrDocument.new)
     super(solr_doc)