diff --git a/app.py b/app.py
index d896fb6..fbad831 100755
--- a/app.py
+++ b/app.py
@@ -26,7 +26,7 @@ def query(query_string, jsonld_frame=None):
     """
 
     http_request = requests.post(
-        'http://dokk:7000/dokk',
+        'http://dokk:7000/dokk?default-graph-uri=urn:x-arq:UnionGraph',
         data = { 'format': 'json', 'query': query_string})
 
     results = http_request.json()